MAINTAINERS: Update myself as maintainer for DEVFREQ subsystem support

Update myself to the DEVFREQ entry as maintainer from reviewer and
the git repository information to manage the devfreq patches. I've been
reviewing and tesing the devfreq support for the couple of years as reviewer.
>From now, I'll help and reiview the devfreq as maintainer.

Suggested-by: MyungJoo Ham <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
Acked-by: MyungJoo Ham <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

MAINTAINERS

@@ -3532,7 +3532,7 @@ BUS FREQUENCY DRIVER FOR SAMSUNG EXYNOS
 M:	Chanwoo Choi <[email protected]>
 L:	[email protected]
 L:	[email protected]
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
 S:	Maintained
 F:	drivers/devfreq/exynos-bus.c
 F:	Documentation/devicetree/bindings/devfreq/exynos-bus.txt
@@ -4762,9 +4762,9 @@ F:	include/linux/devcoredump.h
 DEVICE FREQUENCY (DEVFREQ)
 M:	MyungJoo Ham <[email protected]>
 M:	Kyungmin Park <[email protected]>
-R:	Chanwoo Choi <[email protected]>
+M:	Chanwoo Choi <[email protected]>
 L:	[email protected]
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
 S:	Maintained
 F:	drivers/devfreq/
 F:	include/linux/devfreq.h
@@ -4774,7 +4774,7 @@ F:	include/trace/events/devfreq.h
 DEVICE FREQUENCY EVENT (DEVFREQ-EVENT)
 M:	Chanwoo Choi <[email protected]>
 L:	[email protected]
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git
 S:	Supported
 F:	drivers/devfreq/event/
 F:	drivers/devfreq/devfreq-event.c