cleanup: remove ryu roothash functionality

Ryu was a canceled Chrome OS project (it launched with Android
instead).

6 years later and this unused code is still kicking around.  Delete
it.

BUG=b:186777279
BRANCH=none
TEST=compile futility

Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
Change-Id: Ic359413bc22a51ac8839e3e062234b1fd99a262c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2861022
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
5 files changed