audio: Fix for volume level mismatch for AVRCP headset

-The volume level sent to AVRCP module from AudioService
 is incorrect.
-The volume level need to scale down for AVRCP module.
-Divide volume level by 10 to match AVRCP module volume
 levels.

Change-Id: Ieb8146797d0b552311b1a4782c45aea1be73e492
CRs-Fixed: 561649