Merge "Send Empty packet in MSRP" am: b3291bb1f4 am: 724d3eabe8 am: 1873877922 am: 7654ef3ed5

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1608753

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1139c57a71cac6edd0747f1a2fda4e8c16d51fec