binder: abstract out key/cert config

This change allows certificates and keys to be configured in
a custom way.

Bug: 199344157
Fixes: 200195645
Test: pass

Change-Id: I7b88f21652142fd78e99bc5352f1e78000ca050f
diff --git a/libs/binder/tests/Android.bp b/libs/binder/tests/Android.bp
index 1968058..6f3c6e2 100644
--- a/libs/binder/tests/Android.bp
+++ b/libs/binder/tests/Android.bp
@@ -153,6 +153,7 @@
 
     srcs: [
         "binderRpcTest.cpp",
+        "RpcAuthTesting.cpp",
         "RpcCertificateVerifierSimple.cpp",
     ],
     shared_libs: [