Fix avrcp volume asynchronous

[Description]
The host side adjusts the volume,
some speaker will return the volume to the host.

However, due to the calculation deviation,
the volume on both sides is inconsistent.

Bug: 213544314
[Test Report]
Test: 1. A2DP Source: PASS
      2. AVRCP Target: PASS

Change-Id: I69a9fe83a7453c5ddea06480862a464c176c4ae1