This add gd32vf103v_eval, gd32a503v_eval and gd32f470i_eval boards to flash common test. Boards | Flash Type ------------------------------- gd32vf103v_eval | gd32 fmc v1 gd32a503v_eval | gd32 fmc v2 gd32f470i_eval | gd32 fmc v3 Signed-off-by: HaiLong Yang <hailong.yang@brainco.cn>