MAINTAINERS: Re-assert MMCI driver maintainer status

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

MAINTAINERS

@@ -670,7 +670,8 @@ F:	drivers/input/serio/ambakmi.*
 F:	include/linux/amba/kmi.h
 
 ARM PRIMECELL MMCI PL180/1 DRIVER
-S:	Orphan
+M:	Russell King <linux@arm.linux.org.uk>
+S:	Maintained
 F:	drivers/mmc/host/mmci.*
 F:	include/linux/amba/mmci.h