ARM: dts: msm: enable AMOLED panel on SDM670

Enable FHD AMOLED panel on SDM670 which enables
validation of pm660a and few display post processing
features.

Change-Id: I48bf2ff949c034d4186fcd36f3042fa2c2908ea0
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>