CVE-2022-50636 PCI: Fix pci_device_is_present() for VFs by checking PF

In the Linux kernel, the following vulnerability has been resolved: PCI: Fix pcideviceispresent for VFs by checking PF pcideviceispresent previously didn't work for VFs because it reads the Vendor and Device ID, which are 0xffff for VFs, which looks like they aren't present. Check the PF instead...