Consolidate smart stepper driver initialization

Marlin/src/feature/power.cpp

@@ -88,6 +88,11 @@ void Power::check() {
 void Power::power_on() {
   lastPowerOn = millis();
   PSU_PIN_ON();
+
+  #if HAS_TRINAMIC
+    delay(100); // Wait for power to settle
+    restore_stepper_drivers();
+  #endif
 }
 
 void Power::power_off() {