ASoC: mxs: add missing MODULE_DESCRIPTION() macro

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in sound/soc/mxs/snd-soc-mxs-pcm.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://msgid.link/r/20240602-md-snd-soc-mxs-pcm-v1-1-1e663d11328d@quicinc.com


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