Fix for issue #394.
Created by: silabs-oysteink
- Removed 'enable_i' from LFSR modules.
- It is no longer possible to write a locked up value to the LFSR, detection is now independent of the enabling of dummies or hint replacements.
Not SEC clean:
- Alert minor caused by writing a locked up value when dummies/hint replacements are disabled.
- Previously, a locked up value could be stored in the LFSR, resulting in a difference in which dummy or hint was generated on the first instruction after enabling.
Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com