Add various test files as testSrcs, so that they run on CI.

Test: go test
Test: TH (now that these are hooked up to TH)

Change-Id: Ia199794ef1a64074f3f9159f8c160ba3e45fd181
diff --git a/android/Android.bp b/android/Android.bp
index 62d5e20..6124654 100644
--- a/android/Android.bp
+++ b/android/Android.bp
@@ -85,9 +85,11 @@
         "androidmk_test.go",
         "apex_test.go",
         "arch_test.go",
+        "bazel_handler_test.go",
         "bazel_test.go",
         "config_test.go",
         "csuite_config_test.go",
+        "defaults_test.go",
         "depset_test.go",
         "deptag_test.go",
         "expand_test.go",