ARM: dts: msm: Add support for dual display on sdmmagpie

This change adds support for 2 independent displays on sdmmagpie
for both video and command modes.

Change-Id: I033ac056ef529d907a1b10c99abda83f065f9b30
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>