DEVELOPERS: add Giulio Benetti as maintainer for board bananapi-m2-ultra

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -1135,9 +1135,11 @@ F:	package/webp/
 F:	package/xapian/
 
 N:	Giulio Benetti <giulio.benetti@benettiengineering.com>
+F:	board/bananapi/bananapi-m2-ultra/
 F:	board/olimex/a*
 F:	configs/amarula_vyasa_rk3288_defconfig
 F:	configs/asus_tinker_rk3288_defconfig
+F:	configs/bananapi_m2_ultra_defconfig
 F:	configs/olimex_a*
 F:	package/at/
 F:	package/binutils/