drm/msm: Add snapshot of SDE, DSI, DP and supporting files

This snapshot includes SDE, DP, DSI, supporting include
files, and Documentation. This change also addresses licensing
update to all files. In the process, all documentation is
moved to display/msm. Snapshot was taken from msm-4.14 as of
commit 5cc0f9c4 ("drivers: net: rmnet: introduce
rmnet traces")

Change-Id: I64d34c19fe432646d3210c1755cd746339f21912
Signed-off-by: Samantha Tran <samtran@codeaurora.org>