Add new board images:

bus=pci,vendor=168c,device=003e,subsystem-vendor=1a56,subsystem-device=1535,variant=RV_0520
bus=pci,vendor=168c,device=003e,subsystem-vendor=1a56,subsystem-device=1535,variant=RV_0519
bus=pci,vendor=168c,device=003e,subsystem-vendor=1028,subsystem-device=0310,variant=RV_0519
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>