[audio][util] Update audio cmd line app

Update the 'audio' command line dev/diags tool to...

++ Report Unique IDs
++ Report Manufacturer strings
++ Report Product strings
++ Report the last plug state time
++ Report AGC capabilities
++ Control AGC state

Test: Manual; Tested on various platforms (NUC, eve, QEMU) with
various drivers (HDA, SST, USB, QEMU) during validation of
previous patches.
Change-Id: Ia7081d3d7feeeb97282ebcf1d4f3a3dffc6c59da

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[zircon][mxtl->fbl] Rename mxtl to fbl

Change-Id: Ie21b6498e1bfb0a7fa0315e40b9e5c3ee78646be

[audio][utils] Move DumpInfo out of the utils library.

Move DumpInfo out of the audio-utils library and into the audio test
app. Also add the ability to dump supported formats to the test app.

Change-Id: I3444f09edd27a8493b2c8b3720be3b952073b272

[audio][utils] Add some functionality to the audio test app.

++ Add the ability to configure the channles, format and sample rate used.
++ Refactor how command line args get parsed.
++ Enable 20, 24 and 32 bit PCM in the WAV sink.
++ Make the sine wave generator obey the configured format.

Change-Id: Id2495c63b787e1740d27d83263178af0736d1a7c

[audio] Continue to phase out the old audio driver interface.

++ Duplicate the device/audio2.h protocol header file into
device/audio.h. Update all symbols to be audio* instead of
audio2*.
++ Duplicate the audio2-utils library, but have it refer to audio*
instead of audio2* everywhere.
++ Rename the audio2 test app to just audio. Make it use audio-utils
instead of audio2 utils.
++ Update the bcm-pcm audio driver to use device/audio.h and audio*
symbols.
++ Update the driver interface documentation to reflect that the name
transition from audio2 -> audio is now complete.

Change-Id: Ic1eaf301cd55072dd2ebb19b61447a37c02b6aad