Remove hidl experimental flag.

No longer needed post C++17.

Bug: N/A
Test: N/A
Change-Id: I8b413b5052ffb2ca97034292e5f9c4d304fdf9c4
diff --git a/Android.bp b/Android.bp
index 5e3566f..8cf4f5d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -14,7 +14,6 @@
 
 cc_defaults {
     name: "hidl-gen-defaults",
-    cpp_std: "experimental",
     cflags: [
         "-Wall",
         "-Werror",