V4L/DVB (5471): Cpia_pp.c: convert to module_{init,exit}

After looking at a section bug (in the non-modular case, clearly
non-init code referenced the __initdata parport_nr[]), I thought it was
time to convert this driver to module_{init,exit}.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>