MAINTAINERS: Fix maintainer entry for mei driver

mei driver has sub modules, those are not
listed via scripts/get_maintainer.pl when using asterisk:
drivers/misc/mei/*
The correct notation is:
drivers/misc/mei/

Cc: Joe Perches <joe@perches.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200729110540.3205585-1-tomas.winkler@intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>