Remove duplicate definition for hidl_defaults

hidl_defaults is already defined under hardware/interfaces.
Removing duplicate definition to fix compilation issue.

Change-Id: I40800e4a764a97d39a78ec0df52cac39f5b5fd71
diff --git a/Android.bp b/Android.bp
index 79e8609..7aef46b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,11 +1,3 @@
 subdirs = [
     "*"
 ]
-
-cc_defaults {
-    name: "hidl_defaults",
-    cflags: [
-        "-Wall",
-        "-Werror",
-    ],
-}