V4L/DVB (6173a): Documentation: Remove reference to dead "cpia_pp=" boot-time option

Since this boot-time option was removed in commit
9ab7e323, delete the reference to it.
Signed-off-by: NRobert P. J. Day <rpjday@mindspring.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

Documentation/kernel-parameters.txt

@@ -468,9 +468,6 @@ and is between 256 and 4096 characters. It is defined in the file
 			Format:
 			<first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
 
-	cpia_pp=	[HW,PPT]
-			Format: { parport<nr> | auto | none }
-
 	crashkernel=nn[KMG]@ss[KMG]
 			[KNL] Reserve a chunk of physical memory to
 			hold a kernel to switch to with kexec on panic.