Instead of downloading the firmware for prism54 devices in the
wireless.mk do it in an extra package Makefile. To ship the complete
source code Intel ships our modified OpenWrt/LEDE + the content of the
dl directory. We do not want to have any files in the dl/ directory
which are not needed to build our images. The prism54 gets downloaded
every time independently of building kmod-net-prism54 or not. When it
is in a own package it only gets downloaded when the firmware package
is selected.
Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>