DEVELOPERS: add myself as developer for raspberrypi

Signed-off-by: Gaël PORTAY <gael.portay+rtone@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit 9a271f9646cfcbe494f8356dfe43dab53fdec298)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1128,6 +1128,10 @@ N:	Frank Vanbever <frank.vanbever@mind.be>
 F:	package/libmodsecurity/
 F:	package/nginx-modsecurity/
 
+N:	Gaël PORTAY <gael.portay+rtone@gmail.com>
+F:	board/raspberrypi/
+F:	configs/raspberrypi*
+
 N:	Gao Xiang <hsiangkao@aol.com>
 F:	package/erofs-utils/