[kmac] Convert entropy fsm to sparse encode
[kmac] Convert entropy fsm to sparse encode

This commit revises entropy module FSM encoding into sparse encoding
with `util/design/sparse-fsm-encode.py`.

Signed-off-by: Eunchan Kim <cb7bc7ceb22698f298c67faa994fd9ddf3cab298@opentitan.org>

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