media: ipu6: Add PCI device table header

Add a header for the PCI device table of all IPU6 devices. This will be
used by the IPU bridge as well so place the table in a header.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>