Allow TEMP_CHAMBER_PIN override

Marlin/src/pins/mega/pins_CNCONTROLS_11.h

@@ -54,7 +54,10 @@
 #define TEMP_2_PIN          2   // Analog Input.  9 for tool3 -> 2 for chambertemp
 #define TEMP_3_PIN         11   // Analog Input. 11 for tool4 -> 2 for chambertemp
 #define TEMP_BED_PIN        1   // Analog Input
-//#define TEMP_CHAMBER_PIN    2   // Analog Input
+
+#ifndef TEMP_CHAMBER_PIN
+  //#define TEMP_CHAMBER_PIN 2  // Analog Input
+#endif
 
 //
 // Heaters / Fans

Marlin/src/pins/mega/pins_CNCONTROLS_12.h

@@ -54,7 +54,10 @@
 #define TEMP_2_PIN         13   // Analog Input. 10 for tool3 -> 13 for chambertemp
 #define TEMP_3_PIN         11   // Analog Input. 11 for tool4 -> 13 for chambertemp
 #define TEMP_BED_PIN       14   // Analog Input
-//#define TEMP_CHAMBER_PIN   13   // Analog Input
+
+#ifndef TEMP_CHAMBER_PIN
+  //#define TEMP_CHAMBER_PIN 13 // Analog Input
+#endif
 
 //
 // Heaters / Fans

Marlin/src/pins/mega/pins_CNCONTROLS_15.h

@@ -49,7 +49,10 @@
 //
 #define TEMP_0_PIN          2   // Analog Input
 #define TEMP_BED_PIN        4   // Analog Input
-#define TEMP_CHAMBER_PIN    5   // Analog Input
+
+#ifndef TEMP_CHAMBER_PIN
+  #define TEMP_CHAMBER_PIN  5   // Analog Input
+#endif
 
 //
 // Heaters

Marlin/src/pins/ramps/pins_RUMBA.h

@@ -120,7 +120,10 @@
 
 // Optional for extruder 4 or chamber:
 //#define TEMP_X_PIN         12   // Analog Input (default connector for thermistor *T3* on rumba board is used)
-//#define TEMP_CHAMBER_PIN   12   // Analog Input (default connector for thermistor *T3* on rumba board is used)
+
+#ifndef TEMP_CHAMBER_PIN
+  //#define TEMP_CHAMBER_PIN 12   // Analog Input (default connector for thermistor *T3* on rumba board is used)
+#endif
 
 #if TEMP_SENSOR_BED == -1
   #define TEMP_BED_PIN      7   // Analog Input (connector *K3* on RUMBA thermocouple ADD ON is used <-- this can't be used when TEMP_SENSOR_2 is defined as thermocouple)

Marlin/src/pins/stm32/pins_BLACK_STM32F407VE.h

@@ -88,7 +88,10 @@
 #define TEMP_0_PIN         PC0  // T0
 #define TEMP_1_PIN         PC1  // T1
 #define TEMP_BED_PIN       PC2  // TB
-#define TEMP_CHAMBER_PIN   PC3  // TC
+
+#ifndef TEMP_CHAMBER_PIN
+  #define TEMP_CHAMBER_PIN PC3  // TC
+#endif
 
 //
 // Heaters / Fans