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

MAINTAINERS

@@ -8789,7 +8789,7 @@ M:	Tomas Winkler <tomas.winkler@intel.com>
 L:	linux-kernel@vger.kernel.org
 S:	Supported
 F:	Documentation/driver-api/mei/*
-F:	drivers/misc/mei/*
+F:	drivers/misc/mei/
 F:	drivers/watchdog/mei_wdt.c
 F:	include/linux/mei_cl_bus.h
 F:	include/uapi/linux/mei.h