arm/dt: msm8974: add support for Dragonboard camera sensors

Dragonboard has two CSI interfaces on SOM and an additional CSI
on the Carrier board. This Device Tree include provides Dragonboard
target specific CSI configuration.

Change-Id: Id28c27167c02ad2c98fa2330432320e2e98c917f
Signed-off-by: Eugene Yasman <eyasman@codeaurora.org>
Signed-off-by: Ilia Lin <ilialin@codeaurora.org>