[aes] Fix lint errors related to unused clock and reset signals
[aes] Fix lint errors related to unused clock and reset signals

If fully combinational S-Box implementations are used, these signals are
unused.

Signed-off-by: Pirmin Vogel <386a7fc8e7338ed7899b4d9883c0ebec5de81366@lowrisc.org>

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