Remove workaround armclang error: Failed to check out a license

Fixed with preserving the environment variables in the docker images:
https://git.trustedfirmware.org/ci/dockerfiles.git/commit/?id=afdf3d4d087f0c2234ad213e5f6b8dfdcfa1bf6d

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: I9f82e4f4698de6bed6085a4bf9fc625aaa154049
1 file changed