MAINTAINERS: add a mailing list for DAMON development

This commit adds an open mailing list for DAMON in MAINTAINERS file.

Link: https://lkml.kernel.org/r/20220503180741.137079-1-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

MAINTAINERS

@@ -5438,6 +5438,7 @@ F:	net/ax25/sysctl_net_ax25.c
 
 DATA ACCESS MONITOR
 M:	SeongJae Park <sj@kernel.org>
+L:	damon@lists.linux.dev
 L:	linux-mm@kvack.org
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-kernel-mm-damon