ARM: dts: msm: update 4k panel roi alignment for msm8996

The panel roi height should be a multiple of DSC slice height.
If there is a mismatch, it could lead to pingpong timeouts.
Updating the panel roi alignment for Sharp 4k panel.

Change-Id: Ie6db99c5e374cc8924ee682738e78c64ffa79b37
Signed-off-by: Krishna Chaitanya Devarakonda <kdevarak@codeaurora.org>