LinuxKPI: pci: implement for_each_pci_dev() and improve pci_get_device()

Implement for_each_pci_dev() needed by a wireless driver update.
For that also improve pci_get_device() and add the functionality to
support the odev argument to start searching from that.

Sponsored by: The FreeBSD Foundation (intially)
MFC after: 3 days
Reviewed by: dumbbell
Differential Revision: https://reviews.freebsd.org/D52066