Add implementation for hwbinder benchmark service.

Bug:32279499
Test: make android.hardware.tests.libhwbinder@1.0-impl
Change-Id: I75056afa32b8189020608779ec495659ea35ed48
diff --git a/Android.bp b/Android.bp
index 85ab629..84e11e5 100644
--- a/Android.bp
+++ b/Android.bp
@@ -14,6 +14,7 @@
     "tests/foo/1.0",
     "tests/foo/1.0/default",
     "tests/libhwbinder/1.0",
+    "tests/libhwbinder/1.0/default",
     "tests/msgq/1.0",
     "tests/pointer/1.0",
     "tests/pointer/1.0/default",