When supported, the true random number generator provide to API calls,
to initialize it and to retrieve a random number.
BRANCH=none
BUG=chrome-os-partner:43025
TEST=with other patches in place TPM2 gets proper random numbers
stream.
Change-Id: I11effdf6f81ca76581a354218203620708195b2b
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/306688
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
