drm/vc4: Use drm_free_large() on handles to match its allocation.

If you managed to exceed the limit to switch to vmalloc, we'd use the
wrong free.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: d5b1a78a ("drm/vc4: Add support for drawing 3D frames.")
Cc: stable@vger.kernel.org