DEVELOPERS: add Giulio Benetti to package rtl8821cu

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

DEVELOPERS

@@ -1163,6 +1163,7 @@ F:	package/rtl8723bu/
 F:	package/rtl8723ds/
 F:	package/rtl8812au-aircrack-ng/
 F:	package/rtl8821au/
+F:	package/rtl8821cu/
 F:	package/sunxi-mali-utgard/
 F:	package/sunxi-mali-utgard-driver/
 F:	package/sunxi-tools/