Adding support for VRX518 (and maybe VRX320)

@blogic
A question for you since you commited to various gitlab.com/prpl-foundation/intel repos:

For VRX518 support we require the following firmware files:

The first two don't have a license file at all. The last one has "Intel Confidential Information 10.24.2016"
Are you in a position to poke anyone to get these under something compatible for OpenWrt to use and ship?
I don't know if the latter is compatible, but IIRC the lantiq firmware for VR9 had a special/open license for that reason?