vfio/pci: Remove shadow ROM specific code paths

After commit 0c0e0736 ("PCI: Set ROM shadow location in arch code,
not in PCI core"), the shadow ROM works the same as regular ROM BARs so
these code paths are no longer needed.

Signed-off-by: Yunxiang Li <Yunxiang.Li@amd.com>
Link: https://lore.kernel.org/r/20250102185013.15082-2-Yunxiang.Li@amd.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>