fix the led_matrix.h naming conflict

quantum/led_matrix.c

@@ -20,7 +20,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "quantum.h"
-#include "led_matrix.h"
+#include "ledmatrix.h"
 #include "progmem.h"
 #include "config.h"
 #include "eeprom.h"

quantum/led_matrix_drivers.c

@@ -18,7 +18,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "quantum.h"
-#include "led_matrix.h"
+#include "ledmatrix.h"
 
 /* Each driver needs to define a struct:
  *

quantum/quantum.h

@@ -29,7 +29,7 @@
 #include "keymap.h"
 #ifdef BACKLIGHT_ENABLE
     #ifdef LED_MATRIX_ENABLE
-        #include "led_matrix.h"
+        #include "ledmatrix.h"
     #else
         #include "backlight.h"
     #endif