[rom_ext/sival] Remove RSA signed sival dependencies.

The `mask_rom` no longer supports RSA sigverify. This change removes
pre-signed and other sival targets that where depending on `mask_rom`
RSA keys.

Signed-off-by: Miguel Osorio <miguelosorio@google.com>

hw/top_earlgrey/BUILD

@@ -448,9 +448,12 @@ silicon(
         "exit_failure": DEFAULT_TEST_FAILURE_MSG,
         "assemble": "{rom_ext}@0 {firmware}@0x10000",
     },
+    # The //conditions:default ROM_EXT needs to be updated to use the following
+    # target once available:
+    # //sw/device/silicon_creator/rom_ext/sival/binaries:rom_ext_real_prod_signed_slot_a
     rom_ext = select({
         "//signing:test_keys": "//sw/device/silicon_creator/rom_ext/sival:rom_ext_fake_prod_signed_slot_a",
-        "//conditions:default": "//sw/device/silicon_creator/rom_ext/sival/binaries:rom_ext_real_prod_signed_slot_a",
+        "//conditions:default": "//sw/device/silicon_creator/rom_ext/sival:rom_ext_fake_prod_signed_slot_a",
     }),
     rsa_key = select({
         "//signing:test_keys": {"//sw/device/silicon_creator/rom_ext/keys/fake:rom_ext_test_private_key_0": "test_key_0"},

sw/device/silicon_creator/rom_ext/sival/BUILD

@@ -136,8 +136,8 @@ offline_signature_attach(
     srcs = [
         ":presigning",
     ],
-    rsa_signatures = [
-        "//sw/device/silicon_creator/rom_ext/sival/signatures:rsa_signatures",
+    ecdsa_signatures = [
+        "//sw/device/silicon_creator/rom_ext/sival/signatures:ecdsa_signatures",
     ],
     tags = ["manual"],
 )

sw/device/silicon_creator/rom_ext/sival/binaries/BUILD

@@ -4,12 +4,4 @@
 
 package(default_visibility = ["//visibility:public"])
 
-filegroup(
-    name = "rom_ext_real_prod_signed_slot_a",
-    srcs = ["rom_ext_real_prod_signed_slot_a_silicon_creator.signed.bin"],
-)
-
-filegroup(
-    name = "rom_ext_real_prod_signed_slot_b",
-    srcs = ["rom_ext_real_prod_signed_slot_b_silicon_creator.signed.bin"],
-)
+# Add silicon binary targets once available.

sw/device/silicon_creator/rom_ext/sival/signatures/BUILD

@@ -5,8 +5,8 @@
 package(default_visibility = ["//visibility:public"])
 
 filegroup(
-    name = "rsa_signatures",
-    srcs = glob(["*.rsa_sig"]),
+    name = "ecdsa_signatures",
+    srcs = glob(["*.ecdsa_sig"]),
 )
 
 filegroup(