Use the common pattern for auto fan pins

Now that pins.h is guaranteed included after configs.

Marlin/src/pins/stm32f7/pins_REMRAM_V1.h

@@ -99,7 +99,9 @@
 #endif
 #define FAN1_PIN                              32  // "FAN2"
 
-#define ORIG_E0_AUTO_FAN_PIN                  32  // Use this by NOT overriding E0_AUTO_FAN_PIN
+#ifndef E0_AUTO_FAN_PIN
+  #define E0_AUTO_FAN_PIN                     32
+#endif
 
 //
 // Servos

Marlin/src/pins/stm32f7/pins_THE_BORG.h

@@ -127,7 +127,9 @@
 #define FAN1_PIN                            PA0
 #define FAN2_PIN                            PA1
 
-#define ORIG_E0_AUTO_FAN_PIN                PA1   // Use this by NOT overriding E0_AUTO_FAN_PIN
+#ifndef E0_AUTO_FAN_PIN
+  #define E0_AUTO_FAN_PIN                   PA1
+#endif
 
 //
 // Misc. Functions