psa: Avoid re-definition of MBEDTLS_PSA_CRYPTO_C

Mbed TLS now enables PSA APIs by default on all targets. It's not
necessary to explicitly enable MBEDTLS_PSA_CRYPTO_C, as that can be
gotten from the Mbed TLS config.h.

However, many PSA targets depend on `-DMBEDTLS_PSA_CRYPTO_C` being
defined by the Mbed OS json configuration system and are not yet
properly including the Mbed TLS configuration; for these PSA targets,
warnings may remain until this issue is fixed.

Avoiding re-definition will eliminate warnings like the following, when
building mbed-os-example-blinky:

    Compile [ 14.5%]: pal_client_api_empty_intf.c
    [Warning] pal_client_api_intf.h@35,0: "PSA_SUCCESS" redefined
    Compile [ 14.6%]: pal_client_api_intf.c
    Compile [ 14.7%]: DeviceKey.cpp
    Compile [ 14.9%]: pal_internal_trusted_storage_intf.c
    [Warning] pal_internal_trusted_storage_intf.c@45,9: 'psa_its_set' is deprecated: PS specific types should not be used [-Wdeprecated-declarations]
    Compile [ 15.3%]: val_attestation.c
    [Warning] client.h@40,0: "PSA_VERSION_NONE" redefined
    <..>
    Compile [ 33.3%]: asn1parse.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 33.5%]: aes.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 33.6%]: asn1write.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 33.7%]: psa_crypto.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 33.8%]: blowfish.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 33.9%]: camellia.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.0%]: base64.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.2%]: ccm.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.3%]: chacha20.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.4%]: chachapoly.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.5%]: cipher_wrap.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.6%]: cmac.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.7%]: cipher.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 34.9%]: bignum.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 35.0%]: des.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 35.1%]: dhm.c
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 35.2%]: ctr_drbg.c
    <..>
    Compile [ 70.9%]: EthernetInterface.cpp
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 71.0%]: InternetSocket.cpp
    Compile [ 71.1%]: L3IPInterface.cpp
    [Warning] config.h@2838,0: "MBEDTLS_PSA_CRYPTO_C" redefined
    Compile [ 71.2%]: NetworkInterface.cpp

targets/targets.json

@@ -1485,7 +1485,7 @@
             "PSA"
         ],
         "is_disk_virtual": true,
-        "macros": ["CPU_MK64FN1M0VMD12", "FSL_RTOS_MBED", "MBEDTLS_PSA_CRYPTO_C"],
+        "macros": ["CPU_MK64FN1M0VMD12", "FSL_RTOS_MBED"],
         "inherits": ["Target"],
         "detect_code": ["0240"],
         "device_has": [
@@ -1773,7 +1773,7 @@
             "PSA"
         ],
         "is_disk_virtual": true,
-        "macros": ["CPU_MK66FN2M0VMD18", "FSL_RTOS_MBED", "MBEDTLS_PSA_CRYPTO_C"],
+        "macros": ["CPU_MK66FN2M0VMD18", "FSL_RTOS_MBED"],
         "inherits": ["Target"],
         "detect_code": ["0311"],
         "device_has": [
@@ -2816,8 +2816,7 @@
         "components_add": ["FLASHIAP"],
         "macros_add": [
             "USB_STM_HAL",
-            "USBHOST_OTHER",
-            "MBEDTLS_PSA_CRYPTO_C"
+            "USBHOST_OTHER"
         ],
         "device_has_add": [
             "ANALOGOUT",
@@ -4561,9 +4560,6 @@
         "device_has_remove": [],
         "extra_labels_add": ["PSA"],
         "components_add": ["SD", "FLASHIAP"],
-        "macros_add": [
-            "MBEDTLS_PSA_CRYPTO_C"
-        ],
         "config": {
             "stdio_uart_tx_help": {
                 "help": "Value: D8(default) or D1"
@@ -8649,7 +8645,7 @@
         ],
         "device_name": "GD32F450ZI",
         "detect_code": ["1702"],
-        "macros_add": ["GD32F450", "MBEDTLS_PSA_CRYPTO_C"],
+        "macros_add": ["GD32F450"],
         "bootloader_supported": true,
         "release_versions": ["5"],
         "overrides": {