[media] media: omap3isp: video: drop setting of vb2 buffer state to VB2_BUF_STATE_ACTIVE

There isn't a need to assign the state of vb2_buffer to active
as this is already done by the core.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>