Merge "Stop reducing RA advertised ipv6 mtu by 16 - not needed." into rvc-dev...

Merge "Stop reducing RA advertised ipv6 mtu by 16 - not needed." into rvc-dev am: 14756a8c am: 3810d84f am: b8db1e05

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11620914

Change-Id: Ic1de00567516a34657893a4f309010c2aadf9b23