[automerger skipped] AVRCP: Use calloc to zero reserved fields am: 89df81fc -s ours am: fc36e3a1

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bt/+/13204458

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib996cf0eaacc56daaff94a0e80d44e1d5191dbba