MAINTAINERS: remove unusd ARM/QUALCOMM MSM pattern

Commit 87933a68dce6 ("mfd: pm8921: Remove pm8xxx API now that
sub-devices use regmap") removed the file, remove the pattern.

Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>