MAINTAINERS: Fix file pattern for ARM/APPLE MACHINE SOUND DRIVERS

This is what was meant of course.

Fixes: 3df5d0d9

 ("ASoC: apple: mca: Start new platform driver")
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220901113415.27449-2-povik+lin@cutebit.org
Signed-off-by: Mark Brown <broonie@kernel.org>