Drop early_safe_delay

Marlin/src/core/utility.cpp

   thermalManager.manage_heater(); // This keeps us safe if too many small safe_delay() calls are made
 }
 
-#if ENABLED(MARLIN_DEV_MODE)
-  void early_safe_delay(millis_t ms) {
-    while (ms > 50) {
-      ms -= 50;
-      delay(50);
-      watchdog_refresh();
-    }
-    delay(ms);
-    watchdog_refresh();
-  }
-#endif
-
 // A delay to provide brittle hosts time to receive bytes
 #if ENABLED(SERIAL_OVERRUN_PROTECTION)
 

Marlin/src/core/utility.h

 #include "../core/millis_t.h"
 
 void safe_delay(millis_t ms);           // Delay ensuring that temperatures are updated and the watchdog is kept alive.
-#if ENABLED(MARLIN_DEV_MODE)
-  void early_safe_delay(millis_t ms);   // Delay ensuring that the watchdog is kept alive. Can be used before the Temperature ISR starts.
-#else
-  inline void early_safe_delay(millis_t ms) { safe_delay(ms); }
-#endif
 
 #if ENABLED(SERIAL_OVERRUN_PROTECTION)
   void serial_delay(const millis_t ms);

Marlin/src/lcd/dogm/marlinui_DOGM.cpp

           #endif
           u8g.firstPage();
           do { draw_custom_bootscreen(f); } while (u8g.nextPage());
-          if (frame_time) early_safe_delay(frame_time);
+          if (frame_time) safe_delay(frame_time);
         }
 
       #ifndef CUSTOM_BOOTSCREEN_TIMEOUT
         #define CUSTOM_BOOTSCREEN_TIMEOUT 2500
       #endif
       #if CUSTOM_BOOTSCREEN_TIMEOUT
-        early_safe_delay(CUSTOM_BOOTSCREEN_TIMEOUT);
+        safe_delay(CUSTOM_BOOTSCREEN_TIMEOUT);
       #endif
     }
   #endif // SHOW_CUSTOM_BOOTSCREEN
       constexpr millis_t frame_time = MARLIN_BOOTSCREEN_FRAME_TIME;
       LOOP_L_N(f, COUNT(marlin_bootscreen_animation)) {
         draw_bootscreen_bmp((uint8_t*)pgm_read_ptr(&marlin_bootscreen_animation[f]));
-        if (frame_time) early_safe_delay(frame_time);
+        if (frame_time) safe_delay(frame_time);
       }
     #endif
   }
   void MarlinUI::show_marlin_bootscreen() {
     for (uint8_t q = bootscreen_pages; q--;) {
       draw_marlin_bootscreen(q == 0);
-      if (q) early_safe_delay((BOOTSCREEN_TIMEOUT) / bootscreen_pages);
+      if (q) safe_delay((BOOTSCREEN_TIMEOUT) / bootscreen_pages);
     }
   }