V4L/DVB (3399a): cpia2/cpia2_v4l.c cleanups

- make 2 needlessly global functions static

- remove cpia2_setup(): the driver already allows setting parameters
  through module_param(), and there's no reason for having two different
  ways for setting the same parameters

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