Merge "Update MTU for SoftBank JP as per their request." am: 7d21782d90

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1890235

Change-Id: I26e088eb9812de6284bf5ea845bdb0ee962a92a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>