virtio-gpu api: fix 64/32 compat issue with blob implementation

We encountered this issue when booting blob with a 32-bit kernel.
The implementation doesn't match v6 of the virtio-spec change, so fix
this.

Fixes: ff886cbd ("virtio-gpu api: blob resources")
Signed-off-by: Alistair Delva <adelva@google.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200929215333.1241-1-gurchetansingh@chromium.org


Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>