Merge "[RCS]Add getEncodedMessage() in SipMessage.java" am: 725e04e4f1 am: d5253e5321 am: 3d996ba7b5

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1554295

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3b8bdb27a93f78a4c98b5663a12aec4e96f489fc