Convert DRM_INFO/DRM_ERROR to dev_info/dev_err

[Jerome G. <gl...@fr...>]

Attached is conversion from DRM_INFO/DRM_ERROR to dev_info/dev_err
to apply it copy all doconv* file into the radeon subfolder of the
kernel run ./doconv.sh and then apply the 0001 patch which fix
compilation after conversion (place where struct radeon_device is
missing) then thing should compile

I think it's worthwhile cleanup especialy on multi GPU configuration.

Cheers,
Jerome