vfio/igd: Use version mapping for MTL/ARL quirk selection

Meteor Lake and Arrow Lake use graphics IP version 12.70, but igd_gen()
only returns the major version (generation). Encode the existing device
ID mapping as (version * 100 + release) so that MTL/ARL can be selected
in the BAR0 pcode stolen access quirk instead of a separate device ID
check.

Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
Cc: Yuan Wang <yuan1.wang@intel.com>
Cc: Bosheng Xue <bosheng.xue@intel.com>
Cc: Junjie Cao <junjie.cao@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20261029161702.117078-1-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>