MAINTAINERS: remove Zefan Li

Not active for a long time, so remove myself from MAINTAINERS.

Cc: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Zefan Li <lizf.kern@gmail.com>
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

Author: lizefan

CREDITS

@@ -574,6 +574,9 @@ N: Zach Brown
 E: zab@zabbo.net
 D: maestro pci sound
 
+N: Zefan Li
+D: Contribution to control group stuff
+
 N: David Brownell
 D: Kernel engineer, mentor, and friend.  Maintained USB EHCI and
 D: gadget layers, SPI subsystem, GPIO subsystem, and more than a few

MAINTAINERS

@@ -5775,7 +5775,6 @@ F:	kernel/context_tracking.c
 
 CONTROL GROUP (CGROUP)
 M:	Tejun Heo <tj@kernel.org>
-M:	Zefan Li <lizefan.x@bytedance.com>
 M:	Johannes Weiner <hannes@cmpxchg.org>
 M:	Michal Koutný <mkoutny@suse.com>
 L:	cgroups@vger.kernel.org
@@ -5804,7 +5803,6 @@ F:	include/linux/blk-cgroup.h
 
 CONTROL GROUP - CPUSET
 M:	Waiman Long <longman@redhat.com>
-M:	Zefan Li <lizefan.x@bytedance.com>
 L:	cgroups@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git