sample_in_ball_ctrl module state machine stuck in SIB_DONE state without zeroize or reset

[batthineniatlubis]

In the sampler units, one of the units is sample_in_ball_ctrl which is being used in signing operation. This module got an FSM which traverses from IDLE -> BUFFER -> ACTIVE->DONE, once it reached the"DONE" state the fsm waits for the zeroize or !rst_b signal to jump back to"IDLE" state.On the higher level if the signature is valid for the current request and once this request is served and a new request is triggered without a zeroize or !rst_b then the SampleInball operation immediately returns done signal which isn't actually triggered for this request.

[mojtaba-bisheh]

We assume zeroize is required between two operations, however, we can consider this fix as an enhancement for any use case that doesn't need FIPS certificate to perform zeroize
CCed @Nitsirks