Fix build with Meatpack only on 2nd port (#21336)

Co-authored-by: Scott Lahteine <github@thinkyhead.com>

Marlin/src/inc/Conditionals_LCD.h

@@ -654,13 +654,6 @@
   #define UNUSED_E(E) UNUSED(E)
 #endif
 
-#if ENABLED(DWIN_CREALITY_LCD)
-  #define SERIAL_CATCHALL 0
-  #ifndef LCD_SERIAL_PORT
-    #define LCD_SERIAL_PORT 3 // Creality 4.x board
-  #endif
-#endif
-
 /**
  * The BLTouch Probe emulates a servo probe
  * and uses "special" angles for its state.
@@ -950,6 +943,18 @@
   #define HAS_CLASSIC_E_JERK 1
 #endif
 
+//
+// Serial Port Info
+//
+#ifdef SERIAL_PORT_2
+  #define NUM_SERIAL 2
+  #define HAS_MULTI_SERIAL 1
+#elif defined(SERIAL_PORT)
+  #define NUM_SERIAL 1
+#else
+  #define NUM_SERIAL 0
+  #undef BAUD_RATE_GCODE
+#endif
 #if SERIAL_PORT == -1 || SERIAL_PORT_2 == -1
   #define HAS_USB_SERIAL 1
 #endif
@@ -957,6 +962,13 @@
   #define HAS_ETHERNET 1
 #endif
 
+#if ENABLED(DWIN_CREALITY_LCD)
+  #define SERIAL_CATCHALL 0
+  #ifndef LCD_SERIAL_PORT
+    #define LCD_SERIAL_PORT 3 // Creality 4.x board
+  #endif
+#endif
+
 // Fallback Stepper Driver types that don't depend on Configuration_adv.h
 #ifndef X_DRIVER_TYPE
   #define X_DRIVER_TYPE  A4988