pipe-loader: use radeonsi for MM if amdgpu dri is used

The amdgpu dri is used for the closed source AMD driver. Since this driver
does not implement multimedia, we fall back to radeonsi in mesa to do
multimedia. This corrects the dri driver name for when it is set to amdgpu.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> (v1)
Signed-off-by: Jeremy Newton <Jeremy.Newton@amd.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
1 file changed