[hal] Expose more FPGA functionality (#6942)

- function to reset user rail fault counters
- function to get comms disable count
- correct docs for user rail count functions

hal/src/main/native/sim/HAL.cpp

@@ -339,6 +339,10 @@ HAL_Bool HAL_GetBrownedOut(int32_t* status) {
   return false;  // Figure out if we need to detect a brownout condition
 }
 
+int32_t HAL_GetCommsDisableCount(int32_t* status) {
+  return 0;
+}
+
 HAL_Bool HAL_GetRSLState(int32_t* status) {
   return false;
 }