hw/vfio/pci: Re-order pre-reset

hw/vfio/pci: Re-order pre-reset

We want the device in the D0 power state going into reset, but the
config write can enable the BARs in the address space, which are
then removed from the address space once we clear the memory enable
bit in the command register.  Re-order to clear the command bit
first, so the power state change doesn't enable the BARs.

Cc: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250225215237.3314011-6-alex.williamson@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>