Reduce number of commit, vdev_gicd.c : virtual distributor notify modified interrupt status to outside

vdev_gicd.c : virtual distributor notify modified interrupt status to outside
There is test code in tests_vdev.c

call "vgicd_set_callback_changed_istatus( callback )" in inject rutin.

++ virtual distributor : remove temporary code, divide test code, 8 ~ 16 bits access handling when interrupt changed