Make the android-test-mock-current.txt available for use by the /vendor tests.

Because this change will cause a merge conflict in AOSP, it will be
merged into the main branch first.

Bug: 312324146
Test: Add android-test-mock-current.txt to the Android.bp
Change-Id: I228744137f82e14bec936b11b96cb6876a392487

test-mock/Android.bp

@@ -77,12 +77,13 @@ android_ravenwood_test {
     auto_gen_config: true,
 }
 
-// Make the current.txt available for use by the cts/tests/signature tests.
+// Make the current.txt available for use by the cts/tests/signature and /vendor tests.
 // ========================================================================
 filegroup {
     name: "android-test-mock-current.txt",
     visibility: [
         "//cts/tests/signature/api",
+        "//vendor:__subpackages__",
     ],
     srcs: [
         "api/current.txt",