AVRCP: Inform upper layer if absolute volume isn't supported

Before, the upper layers would be informed when a device connected that
supported absolute volume. Now even devices that don't support absolute
volume get reported.

Bug: 33962015
Test: Run host native test net-test-avrcp
Change-Id: If083ccbb9ba9a170c5bca359e632585d826c6fa5
(cherry picked from commit ca050dac60cef5f5eaffaeca9f7913fa00f77a0c)