Revert "drm/hisilicon: Don't set drm_device->platformdev"

This reverts commit d25bcfb8c2e18b9b36f037f38be4d4792ebf8d57.

I somehow missed that it only compiles on arm64 and broke the driver
rather badly.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
3 files changed