Build with -Wall and -Werror.

Test: pass
Change-Id: I0b14bfca491b67883bdff079b2e863db4691b635
diff --git a/transport/Android.bp b/transport/Android.bp
index 0c32653..b1df04e 100644
--- a/transport/Android.bp
+++ b/transport/Android.bp
@@ -24,6 +24,7 @@
 
 cc_library_shared {
     name: "libhidltransport",
+    cflags: libhidl_flags,
     shared_libs: [
         "libbase",
         "liblog",