Bring Raptor pins in parity with others (#15410)

Marlin/src/pins/ramps/pins_FORMBOT_RAPTOR.h

   #error "Formbot supports up to 3 hotends / E-steppers. Comment out this line to continue."
 #endif
 
-#define BOARD_INFO_NAME      "Formbot Raptor"
-#define DEFAULT_MACHINE_NAME BOARD_INFO_NAME
+#ifndef BOARD_INFO_NAME
+  #define BOARD_INFO_NAME      "Formbot Raptor"
+#endif
+#ifndef DEFAULT_MACHINE_NAME
+  #define DEFAULT_MACHINE_NAME BOARD_INFO_NAME
+#endif
 
 //
 // Servos