[media] omap3isp: ccdc: Increment the frame number at VD0 time for BT.656

We will stop using VD1 in BT.656 mode, move frame number increment to
the VD0 interrupt handler.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Enrico Butera <ebutera@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>