MAINTAINERS: add linux-next info

Add linux-next info to MAINTAINERS for ease of finding this data.

Link: https://lkml.kernel.org/r/20230704054410.12527-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: rddunlap

MAINTAINERS

@@ -12105,6 +12105,13 @@ F:	Documentation/litmus-tests/
 F:	Documentation/memory-barriers.txt
 F:	tools/memory-model/
 
+LINUX-NEXT TREE
+M:	Stephen Rothwell <sfr@canb.auug.org.au>
+L:	linux-next@vger.kernel.org
+S:	Supported
+B:	mailto:linux-next@vger.kernel.org and the appropriate development tree
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/
+
 LIS3LV02D ACCELEROMETER DRIVER
 M:	Eric Piel <eric.piel@tremplin-utc.net>
 S:	Maintained