MAINTAINERS: update maintain status of FIRMWARE LOADER

Recently firmware loader code has been cleaned up much and
cache/uncache firmware mechanism is introduced, so later
drivers should apply the mechanism to solve the problem
of firmware lost during suspend/resume cycle.

For the sake of helping the related problems, I'd like to
volunteer to maintain the code and help on drivers' related
problem, so update the item.
Signed-off-by: NMing Lei <ming.lei@canonical.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -2859,7 +2859,9 @@ F:	include/linux/firewire*.h
 F:	tools/firewire/
 
 FIRMWARE LOADER (request_firmware)
-S:	Orphan
+M:	Ming Lei <ming.lei@canonical.com>
+L:	linux-kernel@vger.kernel.org
+S:	Maintained
 F:	Documentation/firmware_class/
 F:	drivers/base/firmware*.c
 F:	include/linux/firmware.h