ARM: dts: msm: Add support for MSM8994v2

Add support for MSM8994 Rev. 2. This includes updating the
msm-id along with adding Rev.2 device tree files for all
board types and also introducing the v1 variants.

Change-Id: Ia1714386526a0c6e63113b6ca9ea2a024bc5dd3a
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: David Keitel <dkeitel@codeaurora.org>