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 am: cd97367d

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

Change-Id: I88e915c3b641d968cd7a2cbd6800db49541e6250