Prevent L6470 class name conflict with drivers.h define

Fix #12824

Marlin/src/core/drivers.h

 
 #include "../inc/MarlinConfigPre.h"
 
-#define A4988               0x001
-#define A5984               0x002
-#define DRV8825             0x003
-#define LV8729              0x004
-#define L6470               0x105
-#define TB6560              0x006
-#define TB6600              0x007
-#define TMC2100             0x008
-#define TMC2130             2130
-#define TMC2130_STANDALONE  0x009
-#define TMC2208             2208
-#define TMC2208_STANDALONE  0x00A
-#define TMC26X              0x10B
-#define TMC26X_STANDALONE   0x00B
-#define TMC2660             2660
-#define TMC2660_STANDALONE  0x00C
+#define _A4988              0x001
+#define _A5984              0x002
+#define _DRV8825            0x003
+#define _LV8729             0x004
+#define _L6470              0x105
+#define _TB6560             0x006
+#define _TB6600             0x007
+#define _TMC2100            0x008
+#define _TMC2130            2130
+#define _TMC2130_STANDALONE 0x009
+#define _TMC2208            2208
+#define _TMC2208_STANDALONE 0x00A
+#define _TMC26X             0x10B
+#define _TMC26X_STANDALONE  0x00B
+#define _TMC2660            2660
+#define _TMC2660_STANDALONE 0x00C
 
-#define _AXIS_DRIVER_TYPE(A,T) (defined(A##_DRIVER_TYPE) && (A##_DRIVER_TYPE == T))
+#define _ACTUAL(V) _CAT(_, V)
+#define _AXIS_DRIVER_TYPE(A,T) (defined(A##_DRIVER_TYPE) && _ACTUAL(A##_DRIVER_TYPE) == _CAT(_, T))
 
 #define AXIS_DRIVER_TYPE_X(T) _AXIS_DRIVER_TYPE(X,T)
 #define AXIS_DRIVER_TYPE_Y(T) _AXIS_DRIVER_TYPE(Y,T)