mmc: add maintainer for mvsdio driver

Nicolas Pitre accepted to look after the mvsdio driver.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

MAINTAINERS

@@ -2891,6 +2891,12 @@ M:	buytenh@marvell.com
 L:	netdev@vger.kernel.org
 S:	Supported
 
+MARVELL SOC MMC/SD/SDIO CONTROLLER DRIVER
+P:	Nicolas Pitre
+M:	nico@cam.org
+L:	linux-kernel@vger.kernel.org
+S:	Maintained
+
 MARVELL YUKON / SYSKONNECT DRIVER
 P:	Mirko Lindner
 M:	mlindner@syskonnect.de