V4L/DVB (13175): adv7180: Use __devinit and __devexit macros

This patch defines the probe and remove function as __devinit and __devexit.

Signed-off-by: Richard Röjfors <richard.rojfors@mocean-labs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>