When destination scaler is used, the partial update ROI setting from the layer mixer is not correct to program the panel ROI. We need an extra panel ROI setting in such usecase. CRs-Fixed: 1082694 Change-Id: Ieda5d43b6c52987464cf88aba6526da4441ee1d9 Signed-off-by: Benjamin Chan <bkchan@codeaurora.org>