ASoC: dmaengine: Use iov_iter for process callback, too

Along with the conversion to PCM copy ops, use the iov_iter for the
pointer to be passed to the dmaengine process callback, too.  It
avoids the direct reference of iter_iov_addr(), and it can potentially
help for the drivers to access memory properly (although both atmel
and stm drivers don't use the given buffer address at all for now).

Reviewed-by: Mark Brown <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Claudiu Beznea <[email protected]>
Cc: Olivier Moysan <[email protected]>
Cc: Arnaud Pouliquen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

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