FM Radio: avoid deadlock when disabling RDS

When RDS is being configured, the session mutex is hold. However,
when it is being disabled, RDS callbacks might still fire, and these
also try to hold the mutex, leading to a deadlock.

Temporary unlock the mutex while the vendor library is called to
work around.

Change-Id: Ic9751c7185fd8de4a7510225f54d23a22f042321
Swap volume buttons when the screen is rotated (1/2); Lockscreen: Fix mdpi layout issues

Change-Id: I5cd359fb33307c3c120d4d69c429e6f9315aaab9