ARM: dts: msm: enable widebus for DisplayPort on kona

Enable the widebus feature for DisplayPort as this is the
recommended setting as per the hardware programming guide.

Change-Id: I3cc2a7ebd5cd88ed667a3d99a49642d091e290e7
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>