Keystore signing and verification test

After initially connecting to Keystore, continue to create a key to sign
and verify a message.

Bug: 190578423
Test: atest MicrodroidHostTestCases
Change-Id: I4ddd91839689c07ffa6b5f5396f025b1f0471653
diff --git a/tests/testapk/Android.bp b/tests/testapk/Android.bp
index 1122b25..f72d616 100644
--- a/tests/testapk/Android.bp
+++ b/tests/testapk/Android.bp
@@ -16,6 +16,7 @@
     srcs: ["src/native/*.cpp"],
     shared_libs: [
         "android.system.keystore2-V1-ndk_platform",
+        "libbase",
         "libbinder_ndk",
     ],
 }