MAINTAINERS: update Muchun Song's email

I'm moving to the @linux.dev account.  Map my old addresses and update it
to my new address.

Link: https://lkml.kernel.org/r/20221208115548.85244-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

.mailmap

@@ -373,6 +373,8 @@ Ricardo Ribalda <ribalda@kernel.org> <ricardo.ribalda@gmail.com>
 Roman Gushchin <roman.gushchin@linux.dev> <guro@fb.com>
 Roman Gushchin <roman.gushchin@linux.dev> <guroan@gmail.com>
 Roman Gushchin <roman.gushchin@linux.dev> <klamm@yandex-team.ru>
+Muchun Song <muchun.song@linux.dev> <songmuchun@bytedance.com>
+Muchun Song <muchun.song@linux.dev> <smuchun@gmail.com>
 Ross Zwisler <zwisler@kernel.org> <ross.zwisler@linux.intel.com>
 Rudolf Marek <R.Marek@sh.cvut.cz>
 Rui Saraiva <rmps@joel.ist.utl.pt>

MAINTAINERS

@@ -5299,7 +5299,7 @@ M:	Johannes Weiner <hannes@cmpxchg.org>
 M:	Michal Hocko <mhocko@kernel.org>
 M:	Roman Gushchin <roman.gushchin@linux.dev>
 M:	Shakeel Butt <shakeelb@google.com>
-R:	Muchun Song <songmuchun@bytedance.com>
+R:	Muchun Song <muchun.song@linux.dev>
 L:	cgroups@vger.kernel.org
 L:	linux-mm@kvack.org
 S:	Maintained
@@ -9443,7 +9443,7 @@ F:	drivers/net/ethernet/huawei/hinic/
 
 HUGETLB SUBSYSTEM
 M:	Mike Kravetz <mike.kravetz@oracle.com>
-M:	Muchun Song <songmuchun@bytedance.com>
+M:	Muchun Song <muchun.song@linux.dev>
 L:	linux-mm@kvack.org
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-kernel-mm-hugepages