pipe-loader: add support for non-pci (platform) devices

Culled out of the "loader: refactor duplicated code into loader util lib"
patch by Rob Clark.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>

src/gallium/auxiliary/pipe-loader/pipe_loader_drm.c

@@ -121,6 +121,8 @@ pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd)
       ddev->base.type = PIPE_LOADER_DEVICE_PCI;
       ddev->base.u.pci.vendor_id = vendor_id;
       ddev->base.u.pci.chip_id = chip_id;
+   } else {
+      ddev->base.type = PIPE_LOADER_DEVICE_PLATFORM;
    }
    ddev->base.ops = &pipe_loader_drm_ops;
    ddev->fd = fd;