[media] cx231xx: return an error if it can't read PCB config

Instead of using some random value, return an error if the
PCB config is not available or doesn't match a know profile

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/media/usb/cx231xx/cx231xx-cards.c
Simple merge

diff --cc drivers/media/usb/cx231xx/cx231xx-pcb-cfg.c
Simple merge

diff --cc drivers/media/usb/cx231xx/cx231xx-pcb-cfg.h
Simple merge