DEVELOPERS: add Marcin Niestroj to all Grinn boards

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -973,8 +973,8 @@ F:	package/cc-tool/
 F:	package/ecryptfs-utils/
 
 N:	Marcin Niestroj <m.niestroj@grinn-global.com>
-F:	board/grinn/liteboard/
-F:	configs/grinn_liteboard_defconfig
+F:	board/grinn/
+F:	configs/grinn_*
 F:	package/argparse/
 F:	package/easydbus/
 F:	package/rs485conf/