pci_ids.h: add common pci vendor ids from comedi subsystem

There are a number of pci vendor ids that are used in multiple
drivers in the comedi subsystem. Move these ids to pci_ids.h.

This also fixes some build warnings reported by the kbuild test
robot about PCI_VENDOR_ID_AMPLICON being undeclared.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>