packaging: engine-setup - add support for virtio-win >= 1.6.3

virtio-win 1.6.3 reorganized the VFDs to be 32/64 bit.
Added support for virtio-win >= 1.6.3 keeping the compatibility
with the older versions.

Change-Id: Ie2a538dd327bdd692acdc4e7324bd39890e5dccb
Bug-Url: https://bugzilla.redhat.com/919204
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>