Refactor cannonkeys f103 boards to use core backlight (#8089)

* Refactor to use core backlight

* Remove custom implementation

keyboards/cannonkeys/ortho48/config.h

@@ -33,6 +33,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_ROW_PINS { B12, C13, A2, A1 }
 #define DIODE_DIRECTION COL2ROW
 
+#define BACKLIGHT_PIN A8
+#define BACKLIGHT_PWM_DRIVER PWMD1
+#define BACKLIGHT_PWM_CHANNEL 1
 #define BACKLIGHT_LEVELS 6
 #define BACKLIGHT_BREATHING
 #define BREATHING_PERIOD 6
@@ -57,8 +60,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define WS2812_SPI SPID2
 
 
-
-
 /*
  * Feature disable options
  *  These options are also useful to firmware size reduction.