disp: msm: sde: reset ICH on partial update

This change programs both the ich_rst_manual_override and the
ich_rst_manual_value in the DSC encoder to override the hw behavior.
This override is needed to ensure the position of ich_reset is not
changed during the PPS session.

Change-Id: Ia7619a97beeea495706b4327c34fc49ef2298583
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>