ARM: dts: msm: Add qcom,param-override-seq for Kona

The pre-emphasis value for Kona is set to 2 by default.
HPG recommends a value of 1 to avoid overshooting. Add
the parameter override property to set this value to 1.

Change-Id: I45f38565696d617a2714d61cca244b46de50fcd8