Hyper-V: vPCI: Prepopulate device bars

Hyper-V: vPCI: Prepopulate device bars

In recent Hyper-V releases on Windows Server 2022, vPCI code does not
initialize the last 4 bit of device bar registers. This behavior change
could result weird problems cuasing PCI code failure when configuring
bars.

Just write all 1's to those bars whose probed values are not the same
as current read ones. This seems to make Hyper-V vPCI and
pci_write_bar() to cooperate correctly on these releases.

Reported by:	khng@freebsd.org
Tested by:	khng@freebsd.org
MFC after:	2 weeks
Sponsored by:	Microsoft