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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7bb5a4b7f759804f0c3f9138cdd530638c21058a