PCI/IOV: Restore VF resizable BAR state after reset

PCI/IOV: Restore VF resizable BAR state after reset

Similar to regular resizable BARs, VF BARs can also be resized, e.g. by the
system firmware or the PCI subsystem itself.

The capability layout is the same as PCI_EXT_CAP_ID_REBAR.

Add the capability ID and restore it as a part of IOV state.

See PCIe r6.2, sec 7.8.7.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patch.msgid.link/20250702093522.518099-2-michal.winiarski@intel.com