ipq40xx: drop unreachable ipq-wifi package for the AP120C-AC

Harri Hursti reported that ALFA Network AP120C-AC does not
work anymore due to: "Unknown package 'ipq-wifi-alfa-network_ap120c-ac'."

This patch fixes the issue by removing the stale package from
the device's dependencies as the calibration data is now
provided by the upstream board-2.bin.

Reported-by: Harri Hursti <harri@nordicinnovationlabs.com>
Fixes: 8f757d427c ("ipq-wifi: drop upstreamed custom board-2.bin")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/ipq40xx/image/Makefile

@@ -77,7 +77,7 @@ define Device/alfa-network_ap120c-ac
 	DEVICE_VENDOR := ALFA Network
 	DEVICE_MODEL := AP120C-AC
 	DEVICE_DTS := qcom-ipq4018-ap120c-ac
-	DEVICE_PACKAGES := ipq-wifi-alfa-network_ap120c-ac kmod-usb-acm \
+	DEVICE_PACKAGES := kmod-usb-acm \
 		kmod-tpm-i2c-atmel uboot-envtools
 	BLOCKSIZE := 128k
 	PAGESIZE := 2048