media: Documentation: Rework CCS driver documentation

Drop duplicated UAPI specific portions of the CCS (kernel) documentation
and fix a spelling error in UAPI documentation previously fixed in driver
documentation.

Also add references both ways.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>