[rom_ext] Eliminate ROM_EXT RSA application keys (manual cherry-pick)

rules/opentitan.bzl

@@ -125,23 +125,6 @@ SILICON_CREATOR_KEYS = struct(
     ),
 )
 
-SILICON_OWNER_KEYS = struct(
-    FAKE = struct(
-        RSA = struct(
-            TEST = [
-                create_test_key("fake_rsa_rom_ext_test_key_0", "@//sw/device/silicon_creator/rom_ext/keys/fake:rom_ext_test_private_key_0"),
-            ],
-            DEV = [
-                create_dev_key("fake_rsa_rom_ext_dev_key_0", "@//sw/device/silicon_creator/rom_ext/keys/fake:rom_ext_dev_private_key_0"),
-            ],
-            PROD = None,
-        ),
-        # We can't expose real private keys publicly.
-        REAL = None,
-        UNAUTHORIZED = None,
-    ),
-)
-
 def flatten(l):
     return [item for ll in l for item in ll]
 
@@ -170,11 +153,6 @@ ECDSA_SPX_KEY_STRUCTS = [
     create_key_struct(SILICON_CREATOR_KEYS.FAKE.ECDSA.PROD[0], None, SILICON_CREATOR_KEYS.FAKE.SPX.PROD[0]),
 ]
 
-RSA_ONLY_ROM_EXT_KEY_STRUCTS = [
-    create_key_struct(None, SILICON_OWNER_KEYS.FAKE.RSA.TEST[0], None),
-    create_key_struct(None, SILICON_OWNER_KEYS.FAKE.RSA.DEV[0], None),
-]
-
 def _obj_transform_impl(ctx):
     cc_toolchain = find_cc_toolchain(ctx)
     outputs = []
@@ -970,7 +948,7 @@ def opentitan_flash_binary(
         name,
         devices = PER_DEVICE_DEPS.keys(),
         platform = OPENTITAN_PLATFORM,
-        signing_key_structs = ECDSA_ONLY_KEY_STRUCTS + RSA_ONLY_ROM_EXT_KEY_STRUCTS,
+        signing_key_structs = ECDSA_ONLY_KEY_STRUCTS,
         signed = True,
         sim_otp = None,
         testonly = False,

sw/device/silicon_creator/rom_ext/BUILD

@@ -322,6 +322,7 @@ manifest(d = {
 
 opentitan_binary(
     name = "rom_ext_slot_a_bad_address_translation",
+    testonly = True,
     ecdsa_key = {"//sw/device/silicon_creator/rom/keys/fake/ecdsa:test_key_0_ecdsa_p256": "test_key_0"},
     exec_env = [
         "//hw/top_earlgrey:fpga_cw310",
@@ -335,6 +336,7 @@ opentitan_binary(
         ":rom_ext",
         "//sw/device/lib/crt",
         "//sw/device/silicon_creator/lib:manifest_def",
-        "//sw/device/silicon_creator/rom_ext/keys/fake",
+        "//sw/device/silicon_creator/lib/ownership:test_owner",
+        "//sw/device/silicon_creator/lib/ownership/keys/fake",
     ],
 )