Grant 'w' rights to for-system subdirectory for root. am: d9025190fa am: ab80af8eb5 am: a5810680ea am: 9638f11163

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1969499

Change-Id: I41f81fd3001b92b129ec6e774d4e3f146f5fb0ab