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: 35f1bf63

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

Change-Id: I3fe08b0644b62b05987c4eb628264645b09a9e12