Enable checks for encrypted flash in OTA

Even if firmware is compiled without CONFIG_FLASH_ENCRYPTION_ENABLED
Rayionale: CONFIG_FLASH_ENCRYPTION_ENABLED controls whether boot loader
generates keys for encryption or not, but flash encryption can be
configured externally. With this change, it's possible to have boot
loader not generate keys but still have encryption working.

components/app_update/esp_ota_ops.c

@@ -46,10 +46,8 @@ typedef struct ota_ops_entry_ {
     const esp_partition_t *part;
     uint32_t erased_size;
     uint32_t wrote_size;
-#ifdef CONFIG_FLASH_ENCRYPTION_ENABLED
     uint8_t partial_bytes;
     uint8_t partial_data[16];
-#endif
     LIST_ENTRY(ota_ops_entry_) entries;
 } ota_ops_entry_t;
 
@@ -152,7 +150,6 @@ esp_err_t esp_ota_write(esp_ota_handle_t handle, const void *data, size_t size)
                 return ESP_ERR_OTA_VALIDATE_FAILED;
             }
 
-#ifdef CONFIG_FLASH_ENCRYPTION_ENABLED
             if (esp_flash_encryption_enabled()) {
                 /* Can only write 16 byte blocks to flash, so need to cache anything else */
                 size_t copy_len;
@@ -184,7 +181,6 @@ esp_err_t esp_ota_write(esp_ota_handle_t handle, const void *data, size_t size)
                     memcpy(it->partial_data, data_bytes + size, it->partial_bytes);
                 }
             }
-#endif
 
             ret = esp_partition_write(it->part, it->wrote_size, data_bytes, size);
             if(ret == ESP_OK){
@@ -223,8 +219,7 @@ esp_err_t esp_ota_end(esp_ota_handle_t handle)
         goto cleanup;
     }
 
-#ifdef CONFIG_FLASH_ENCRYPTION_ENABLED
-    if (it->partial_bytes > 0 && esp_flash_encryption_enabled()) {
+    if (it->partial_bytes > 0) {
         /* Write out last 16 bytes, if necessary */
         ret = esp_partition_write(&it->part, it->wrote_size, it->partial_data, 16);
         if (ret != ESP_OK) {
@@ -234,7 +229,6 @@ esp_err_t esp_ota_end(esp_ota_handle_t handle)
         it->wrote_size += 16;
         it->partial_bytes = 0;
     }
-#endif
 
     if (esp_image_basic_verify(it->part->address, true, &image_size) != ESP_OK) {
         ret = ESP_ERR_OTA_VALIDATE_FAILED;