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

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: 8f757d427cce ("ipq-wifi: drop upstreamed custom board-2.bin")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>