ARM: dts: msm: add physical dimension for hx83112a truly panel

Add physical dimension property for hx83112a truly panel. These
values will be used to calculate display DPI.

Change-Id: I82858ad65049c6988d2a4622d179c5124dc65d72
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>