[entropy_src/dv] Add entropy_src to CI & nightly
[entropy_src/dv] Add entropy_src to CI & nightly

- entropy_src will not be run as a part of CI as well as the nightly
  regressions

Signed-off-by: Srikrishna Iyer <2803d640feace36379942447842f26c7747b4dc3@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan