TF-M: add environment variables used by the CI scripts

They can be overriden (per instance) in:
  -> Jenkins configure system
    -> global properties
      -> environment variables

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: I4d76103ec2bdbcf895d0b48ae95dbdb8d56452fb
2 files changed