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

SAMA5 HSMCI: Correct multi-block DMA setup; Fixes related to DMA timeout.  Still problems with HSMCI DMA via XDMAC

SAMA4D5 HSMCI: Set burst size to 1, sample DMA registers on timeout, and don't return from transfer until BOTH the HSMCI transfer and DMA complete