veyron/tools/identity: Remove REPO_ROOT reference that was re-merged after deletion.
veyron/tools/identity: Remove REPO_ROOT reference that was re-merged after deletion.

Change-Id: Idfb9b1bac99343745f2fb59bfaa2aaf806edc0e8

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref