ASoC: fsl_easrc: define functions for memory to memory usage

ASRC can be used on memory to memory case, define several
functions for m2m usage and export them as function pointer.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Jaroslav Kysela <perex@perex.cz>
Link: https://patch.msgid.link/20241212074509.3445859-4-shengjiu.wang@nxp.com


Signed-off-by: Mark Brown <broonie@kernel.org>