Documentation: Snapshot of device tree binding document.

This snapshot of Documentation/devicetree/bindings/arm/msm/msm.txt
taken as of msm-4.4 commit <400520a6e2f06cc> ("ASoC: msm: qdsp6v2: Fix
FE id check in routing driver").

CRs-Fixed: 1040840
Change-Id: Ie2ab0a1366b1f8746c0c67ae8c8cb41d04376ce5
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>