MAINTAINERS: add entry for cubieboard7 config

This commit adds entry for cubieboard7 config under Actions Semi
OWL family.
Signed-off-by: NAmit Singh Tomar <amittomer25@gmail.com>

MAINTAINERS

@@ -276,6 +276,7 @@ F:	drivers/clk/owl/
 F:	drivers/serial/serial_owl.c
 F:	include/configs/owl-common.h
 F:	configs/bubblegum_96_defconfig
+F:	configs/cubieboard7_defconfig
 
 ARM RENESAS RMOBILE/R-CAR
 M:	Nobuhiro Iwamatsu <iwamatsu@nigauri.org>