ASoC: fsl_rpmsg: Register different ASoC machine devices

This driver helps register ASoC machine device thus use of
PLATFORM_DEVID_AUTO macro in API can automatically create device for
each sound card based on rpmsg.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20220930064441.2548505-6-chancel.liu@nxp.com


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