Inform AVRCP Controller before cleaning up.

Move the JNI callback earlier in the procedure before the device info is
zeroed out such that the higher levels know which device disconnected.

Bug: 80265765
Test: Disconnect AVRCP and verify bluetooth_manager reports it is
disconnected.

Change-Id: I1c69341227f4c1c1662022a4a77e1752f6306d2e