Audio:  Get rid of the decoder->driver IOCTLs that I added a couple of commits back; Use existing configure method

Audio:  Add hooks for fast-forward and rewind needed by CMediaPlayer; add hooks for equalizer settings needed by the WM8904

NxWM: Beginning integration of NxPlayer into Nxwm::MediaPlayer. Gets handle, sets device, and releases handle.  Lots more to be done

SAMA5D4-EK NSH:  Enable the command line media player in the NSH configuration as well (still does not work, however).

SAMA5D3/4: All configurations.  I suspect a MMC/SD multi-block DMA transfer issue.  So for name, this feature is disabled in all configurations

Rename pcm_decode.h to pcm.h since it will hold more than just decoding definitions.  Fix some porting errors like idbg should auddbg, etc.  Add wav file header and a few low-level wav utilities.

Add new framework for the PCM decoder.  It is now a 'front end' for lower-level drivers like the WM8904 that performs the PCM decoding from end

STM32 OTGFS device:  Various changes to try to reduce that amount of time in interrupts handles and with interrupts disbled.  Needs verification on other platforms.  From Petteri Aimonen

Make sure that all sim configurations have CONFIG_SIM_M32 undefined.  That is probably the wrong default setting, but we need to be consistent above all