MFD maintainer

We probably need someone to look after the few drivers/mfd patches coming
every now and then.  As agreed with Andrew, I'm ok to do so and my
employer is fine with me spending a few working hours on it, if needed.
Ben, Philipp, feel free to add your names there too if you wish.

Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
Cc: "pHilipp Zabel" <philipp.zabel@gmail.com>
Cc: Ian Molton <spyro@f2s.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -2802,6 +2802,12 @@ W:	https://tango.0pointer.de/mailman/listinfo/s270-linux
 W:	http://0pointer.de/lennart/tchibo.html
 S:	Maintained
 
+MULTIFUNCTION DEVICES (MFD)
+P:	Samuel Ortiz
+M:	sameo@openedhand.com
+L:	linux-kernel@vger.kernel.org
+S:	Supported
+
 MULTIMEDIA CARD (MMC), SECURE DIGITAL (SD) AND SDIO SUBSYSTEM
 P:	Pierre Ossman
 M:	drzeus-mmc@drzeus.cx