updates rgblight implementation, makes non-timer stuff compatible with audio

keyboards/lets_split/config.h

@@ -69,9 +69,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 )
 
 /* ws2812 RGB LED */
-#define ws2812_PORTREG  PORTD
-#define ws2812_DDRREG   DDRD
-#define ws2812_pin PD1
+#define RGB_DI_PIN D2
+#define RGBLIGHT_TIMER
 #define RGBLED_NUM 28     // Number of LEDs
 #define RGBLIGHT_HUE_STEP 10
 #define RGBLIGHT_SAT_STEP 17