msm: npu: Add snapshot of NPU driver files

This snapshot includes NPU driver and documentation files.
This change also addresses licensing update to all files.
cxlimit and bandwidth monitor related functions are stripped
out since they are not ready yet. Snapshot was taken from
msm-4.14 as of commit f72b876c.

Change-Id: I1c6c594b6fdd1ac5f67d79d5c655e5c45c81a057
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>