net: qrtr: Add snapshot of QRTR drivers

This snapshot is taken as of msm-4.14 'commit <101274de> ("Merge
"ARM: dts: msm: Change glink intent size for diag on sdmmagpie"")'.

This change brings the QRTR driver up to data with fixes and adds the
MHI transport for msm-4.14. In addition, change the copyrights to SPDX
format and fix formatting errors.

Change-Id: Id9df48bf0d6dffba4e5bd6c607c933c5f1da2997
Signed-off-by: Chris Lew <clew@codeaurora.org>