ARM: dts: qcom: Add initial device tree support for sdm429w

Add device tree support to boot with bare minimum functionality.
As of now kernel timer, serial debug console, cpu map,
memory map are available.

Change-Id: Ib83588060b49bba672c2b4d7ec6e031a6a77173a
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>
Signed-off-by: Archit Saxena <archsaxe@codeaurora.org>
Signed-off-by: Umang Chheda <uchheda@codeaurora.org>