Call AVRC_close when an AVRCP connection is closed

AVRC_Close needs to be called whenever a connection is closed otherwise
the AVCT control block is never cleaned up.

Bug: 77633048
Test: Run host native test net_test_avrcp and connect/disconnect from a
device multiple times.

Change-Id: Ia6a1b2606a87803316aad41ae27db858bf922548