Add a workaround for A2DP devices that request Role Change

Certain A2DP devices request Role Change after connection,
and typically the Phone grants it - as a result the Phone is the Slave.

However, with Multi-A2DP, follow-up A2DP connections require that the
Phone becomes the Master: within the existing stack we have function
bta_av_switch_if_needed() that checks whether the Phone needs to request
Role Change and become again the Master.
Some A2DP devices will refuse the Phone to become the Master again, and
this prevents/blocks the Phone from having multiple A2DP connections
that are open.

Test: Manual
Bug: 72122792
Bug: 70350399
Change-Id: I749c73a38e3fb10262143ba6b41a7d65309ddf49
(cherry picked from commit 5706c1e4)