bhyve: restore the BARs at the addresses the guest gave themHEADmain

A restore set the addresses in the BARs and the command register to
those of the snapshot, but left the regions registered where
pci_emul_alloc_bar() had put them when bhyve started.  That is only
right for a guest that kept bhyve's addresses.  The UEFI firmware moves
64-bit BARs above 4 GB, and after a restore every access to such a BAR
went nowhere:

  Emulating access to non-existent address to 0x800001014

Before the devices are restored, unregister the regions of all of them;
when a device is restored, register its regions at the restored
addresses, if the restored command register enables them.  All devices
go first because a restored BAR may be where another device's BAR is
before the restore.

Signed-off-by: Wanpeng Qian <wanpengqian@gmail.com>
Sponsored by:	keelos.dev
Reviewed by:	bnovkov
Differential Revision:	https://reviews.freebsd.org/D60235
MFC after:	2 weeks
Tested by:	bnovkov

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