Add extra apk mount test

system/etc/fsverity/security/BuildManifest.apk contains a protobuf file
as an asset. This test tries to parse the protobuf file, thus verifying
the extra APK mount.

Bug: 203483081
Test: atest MicrodroidTests
Change-Id: I2ca0bf337fcee0c2df3c32d43685c4cdadcbac91
diff --git a/tests/testapk/Android.bp b/tests/testapk/Android.bp
index 541e93f..6cd16c2 100644
--- a/tests/testapk/Android.bp
+++ b/tests/testapk/Android.bp
@@ -30,6 +30,11 @@
         "libbinder_rpc_unstable",
         "MicrodroidTestNativeLibSub",
     ],
+    static_libs: [
+        "libfsverity_digests_proto_cc",
+        "liblog",
+        "libprotobuf-cpp-lite-ndk",
+    ],
 }
 
 cc_library_shared {