Eliminate MbedTLS from env-test

env-test depends on MbedTLS, but only a single header file is used
from the library and only for trng_adapter tests. Eliminate this
dependency by adding a dummy header with a macro for this test
to simplify this deployment and eliminate an unnecessary MbedTLS
user configuration file.

Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Change-Id: Ia2048576a31066881103c5b64e039816135b3415
4 files changed