media: ti-vpe: cal: add vc and datatype fields to cal_ctx

commit b2d79e2c24d78c8eee088566b0424274b21861f9 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



In preparation for supporting multiple virtual channels and datatypes,
add vc and datatype fields to cal_ctx, initialize them to the currently
used values, and use those fields when writing to the register.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>