ipq40xx: add RT-AC2200 alternative name to RT-AC42U/RT-ACRH17

RT-AC2200 is the same device with a different name. The OEM firmwares have the same MD5.

Signed-off-by: Ray Wang <[email protected]>

target/linux/ipq40xx/image/generic.mk

@@ -214,6 +214,8 @@ define Device/asus_rt-ac42u
 	DEVICE_MODEL := RT-AC42U
 	DEVICE_ALT0_VENDOR := ASUS
 	DEVICE_ALT0_MODEL := RT-ACRH17
+	DEVICE_ALT1_VENDOR := ASUS
+	DEVICE_ALT1_MODEL := RT-AC2200
 	SOC := qcom-ipq4019
 	BLOCKSIZE := 128k
 	PAGESIZE := 2048