ARM: dts: msm: Add panel dimension details for nt35590 panel

Explicitly setting the physical dimensions of the panel helps
in correctly computing the DPI (dots per inch) settings. Add
this information for the nt35590 panel based on the data
provided in the panel specification.

Change-Id: I19b281416d9944585d8a5530d806d85aab55aee5
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>