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: I6ad1cd23388015ef538965c923aa0aa7cc62981f