Add support for amdgpu
Created by: philmmanjaro
I'm working currently on adding support for amdgpu. Followed issues we have:
- the driver only works with kernel 4.2 or higher
- we have to add a function to disable mhwd config for amdgpu (done)
- we have to find a way to remove the package xf86-video-amdgpu from being installed when the kernel is not ready for it yet