MAINTAINERS: update Kevin's email for OMAP PM section

Change my email to TI email address for OMAP PM maintenance.

Signed-off-by: Kevin Hilman <khilman@ti.com>

MAINTAINERS

@@ -4501,7 +4501,7 @@ S:	Maintained
 F:	arch/arm/*omap*/*clock*
 
 OMAP POWER MANAGEMENT SUPPORT
-M:	Kevin Hilman <khilman@deeprootsystems.com>
+M:	Kevin Hilman <khilman@ti.com>
 L:	linux-omap@vger.kernel.org
 S:	Maintained
 F:	arch/arm/*omap*/*pm*