Add car audio emu support to aosp_car_* targets

Bug: 130232630
Test: Manually tested on both x86 flavors.  Can't test ARM.
Change-Id: I9149d42bfd7137f7967d0925af31e11ff2247852
(cherry picked from commit e9cb384330cc8f89aceea4f559be0b7a1c77db7d)
5 files changed