libhardware: tests/tools to vendor

Since these are vendor interfaces, and we are
preventing system tools from using these.

Bug: 37280010
Test: build
Change-Id: I9ffcb4db015de498e1935c96a2866d26b3c936c4
diff --git a/tests/hardware/Android.bp b/tests/hardware/Android.bp
index b137684..a52a4ab 100644
--- a/tests/hardware/Android.bp
+++ b/tests/hardware/Android.bp
@@ -21,5 +21,7 @@
         "-Werror",
     ],
 
+    vendor: true,
+
     include_dirs: ["system/media/camera/include"],
 }