ARM: dts: msm: Add 8GB DDR device tree for msm8996 ivi vplatform

Add a new device tree to support 8GB DDR target for msm8996 IVI
virtual platform.

Change-Id: Ia3be942de1c3064aecc59560743849335e8ff60d
Signed-off-by: Anant Goel <anantg@codeaurora.org>
Signed-off-by: Zhiqiang Tu <ztu@codeaurora.org>