AudioService: fix UID device affinity

Change I2994ae80624556d9321f788a0575d9f732157228 was missing
  a PS to properly call from AudioService methods to
  AudioPolicyProxy methods, log errors from AudioSystem, and
  return the errors to the caller.
Bug:  111647296
Test: requires device with routing policy started by CarService

Change-Id: Iba4d1a3ba3371682915bc526a140fe9237ed3e13