Decoder cleanup plus introduction of sys_en
Created by: Silabs-ArjanB
SEC clean (when ignoring data OBI outputs when data_req_o == 0).
More PRs will follow:
- Fix of Atomic related bug that I spotted
- Actual usage of sys_en
- Actual usage of the introduced *NONE signals to save power
Signed-off-by: Arjan Bink Arjan.Bink@silabs.com