Revert "hal: add custom platform abstraction"

* Handle this in a more extensible way with upcoming platform info
  extension code.

This reverts commit 36a435d08826160ddbf9e0759711f7badae42566.

Change-Id: I9683e27b70f591bff6c5131523ef7c3e51ee6513
Revert "hal: Add speaker backend case handling"

* Handle this in a more extensible way with upcoming platform info
  extension code.

This reverts commit 957c3d94bf34da538b3cd296e17b94a9206fd8d1.

Change-Id: Ie0b86bfd8decd92bda76a2706e5ebd7dcedae89b
audio: extend platform parser

Extend platform parser with support for additional sections.
Supported sections now include acdb ids, pcm device ids and backend names.

Change-Id: Idfbc8a8bb490606686436c107db5b0c7d636ccbe
audio: Extend platform parser to allow device name aliasing

* Supported sections now include device names
* This allows for aliasing device names to a custom name

Change-Id: I880e90a7e887f020517d89ba276199c700c0eeae