[ARM] OMAP: Change mailing list for OMAP in MAINTAINERS

OMAP has now a list at vger.
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

MAINTAINERS

@@ -4005,7 +4005,7 @@ S:      Maintained
 
 TI OMAP MMC INTERFACE DRIVER
 P:	Carlos Aguiar, Anderson Briglia and Syed Khasim
-M:	linux-omap-open-source@linux.omap.com (subscribers only)
+M:	linux-omap@vger.kernel.org
 W:	http://linux.omap.com
 W:	http://www.muru.com/linux/omap/
 S:	Maintained