drm/msm/dsi-staging: Snapshot of DSI Staging files

This snapshot includes changes in DSI files. This change also
has the copyright year update in all the files. Snapshot was
taken from msm-4.14 as of commit 1df57774
("ARM: dts: msm: Remove dma-coherent for IPA for sdxprairie").

Change-Id: I43c1d3163360efd8735874be646650134919770d
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>