ALSA: compress_offload: introduce accel operation mode

There is a requirement to expose the audio hardware that accelerates various
tasks for user space such as sample rate converters, compressed
stream decoders, etc.

This is description for the API extension for the compress ALSA API which
is able to handle "tasks" that are not bound to real-time operations
and allows for the serialization of operations.

For details, refer to "compress-accel.rst" document.

Cc: Mark Brown <[email protected]>
Cc: Shengjiu Wang <[email protected]>
Cc: Nicolas Dufresne <[email protected]>
Cc: Amadeusz Sławiński <[email protected]>
Cc: Pierre-Louis Bossart <[email protected]>
Cc: Vinod Koul <[email protected]>
Signed-off-by: Jaroslav Kysela <[email protected]>
Reviewed-by: Amadeusz Sławiński <[email protected]>
Tested-by: Shengjiu Wang <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Link: https://patch.msgid.link/[email protected]

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