ASoC: fsl: add missing MODULE_DESCRIPTION() macro

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in sound/soc/fsl/imx-pcm-dma.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-fsl-imx-pcm-dma-v1-1-e7efc33c6bf3@quicinc.com


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