APM dump: Indent the name of the USB device properly

Example output:

   2. Port ID: 30; "USB Headset Out"; {AUDIO_DEVICE_OUT_USB_...
      Encapsulation modes: 0, metadata types: 0
      "USB-Audio - HIFI DSD"

Bug: 231976949
Test: adb shell dumpsys media.audio_policy
Change-Id: I2cbcf0bba596d36227b38d60aedf3baa383b9404