media: staging/ipu7: add Intel IPU7 PCI device driver

Intel Image Processing Unit 7th Gen includes input and processing systems
and the hardware presents itself as a single PCI device in system same
as IPU6.

The IPU7 PCI device driver basically does PCI configurations, basic
hardware configuration by its buttress interfaces, loads the
firmware binary, register the auxiliary device which serve for the ISYS
device driver.

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