mmc: Remove Russell as primecell mci maintainer

Russell no longer has the resources to fully test the controller, so
he is stepping down as maintainer.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

MAINTAINERS

@@ -441,10 +441,7 @@ 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
+S:	Orphan
 
 ARM/ADI ROADRUNNER MACHINE SUPPORT
 P:	Lennert Buytenhek