AudioPolicy: Improve audio patches dump

Was:

    Audio Patches:
      Audio patch 1:
      - handle:  5
      - audio flinger handle: 12
      - owner uid: 1041
      - 1 sources:
        - Mix ID 1 I/O handle 13
      - 1 sinks:
        - Device ID 3 AUDIO_DEVICE_OUT_SPEAKER

Now:

    Audio Patches:
      Patch 1: owner uid 1041, handle  5, af handle 12
        [src  1] Mix ID 1 I/O handle 13
        [sink 1] Device ID 3 AUDIO_DEVICE_OUT_SPEAKER

Test: adb shell dumpsys media.audio_policy
Change-Id: I164ab9b384e77929ef44dae019b7ec15239dceaa