Coverity: copy coverity code from tf-a-ci-scripts

This is a complete copy of the two folders [1,2], based on working dir
from commit [3]. Several pieces DO NOT fit in TF-M, i.e. exclude
paths, toolchain, coverity 'build cmd', etc. but we introduce the code as
'it is' from TF-A project for completeness, then following commits would do
proper changes based on this code.

The Coverity Scan is an static analysis tool that works at 'tree
level' and it scans compiled code.

This is part of the tasks intended for milestone 2 (M2) defined at [4].

[1]
https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git/tree/script/tf-coverity

[2]
https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git/tree/coverity

[3]
https://git.trustedfirmware.org/ci/tf-a-ci-scripts.git/commit/?id=97e2ef03aa6aa3ca9cb40e63a14765bda2c105c6

[4] https://developer.trustedfirmware.org/w/collaboration/openci/

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: I90ce8f1e9fcecc54cf80c759073e57f10e339c9c
9 files changed