MAINTAINERS: add linux-leds mail list address and git URL

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -4103,6 +4103,8 @@ F:	drivers/scsi/53c700*
 LED SUBSYSTEM
 M:	Bryan Wu <bryan.wu@canonical.com>
 M:	Richard Purdie <rpurdie@rpsys.net>
+L:	linux-leds@vger.kernel.org
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds.git
 S:	Maintained
 F:	drivers/leds/
 F:	include/linux/leds.h