mmc: add maintainer for ARM Primecell controller

Russell King handles this driver.
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

MAINTAINERS

@@ -421,6 +421,12 @@ P:	Ian Molton
 M:	spyro@f2s.com
 S:	Maintained
 
+ARM PRIMECELL MMCI PL180/1 DRIVER
+P:	Russell King
+M:	rmk@arm.linux.org.uk
+L:	linux-arm-kernel@lists.arm.linux.org.uk (subscribers-only)
+S:	Maintained
+
 ARM/ADI ROADRUNNER MACHINE SUPPORT
 P:	Lennert Buytenhek
 M:	kernel@wantstofly.org