Disable A2DP source for automotive under certain conditions

Problem: We need to enable the a2dp (source & sink) profiles
on car products. However, directly enabling the profiles w/o
enabling the trunk flags for concurrent support will result
in indeterministic behavior.

Solution: Disable a2dp source profile for automotive builds
only if a2dp sink profile is enabled and concurrent support
for a2dp profiles is not enabled.

Test: m
Bug: 329140775
Bug: 321806163
Change-Id: Icf3cf47f07e24ca75c65a0920dca9d464d5a4d7b