amdsbwd: always enable watchdog register decoding
This seems to be required even if the watchdog is accessed via the common
MMIO space.
Tested on:
- Ryzen 3 3200U APU;
- Ryzen 7 5800X CPU with X570 chipset.
(cherry picked from commit cca0d3bbd8c9f8b50c6940c33704a6c8c464b68f)