Coverity: shadow clone mbed-tls

Avoids some (unnecessary) git content download. It also removes some
code that does the tag checkout and instead it is done at the same
git-clone command.

Change-Id: If690a871578325faa8d6b65d8d80261e771a5077
Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
2 files changed