Revert "V4L/DVB (6173a): Documentation: Remove reference to dead "cpia_pp=" boot-time option"
This reverts commit 4730d3af625b532e3df5f091b5c8edb08f512fbf.
Unfortunately, patch got mangled by a whitespace removal script.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>