ARM: dts: msm: tuning otm8018b configuration

correct otm8018b resolution and dsi timming.
As this panel`s resolution is 480 * 854 not
480 * 800.

Change-Id: I368d0a60c1c5c48334b11b641f1ff440356c5b1d
Signed-off-by: Shuo Yan <shuoy@codeaurora.org>