MAINTAINERS: LEDs: Add designated reviewer for LED subsystem

Add a designated reviewer for the LED subsystem as there
are already two maintainers assigned.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>

MAINTAINERS

@@ -8698,6 +8698,7 @@ F:	scripts/leaking_addresses.pl
 LED SUBSYSTEM
 M:	Jacek Anaszewski <jacek.anaszewski@gmail.com>
 M:	Pavel Machek <pavel@ucw.cz>
+R:	Dan Murphy <dmurphy@ti.com>
 L:	linux-leds@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds.git
 S:	Maintained