ARM: dts: msm: Add device tree support for msm8940

Add initial set of device tree files to build the
msm8940 target. This implementation is based on
snapshot of the msm8940 device tree from msm-3.18.
commit d0eb392e8733c
("ARM: dts: msm: Add support for MSM8940").

Change-Id: Icc0d37dbde746b9ad82286c192585d7d047ba70e
Signed-off-by: Naitik Bharadiya <bharad@codeaurora.org>
Signed-off-by: Chetan C R <cravin@codeaurora.org>