msm: mdss: dynamically configure dsc ich_reset override

ich_reset override should be used only when partial update is enabled
where full frame and partial frame have different number of slices.
Since it is not dependent on panel, remove its configuration from
panel device tree and dynamically configure based on current frame
information.

Change-Id: Ia7d66e4a3e1b8bb1bab71e6a2d24eb58e00c238c
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>