freoduo: define RGBLight config at keyboard level (#11491)

Configurator compiles fail without the number of LEDs defined here. Included the rest to match the default keymap's settings.

keyboards/handwired/freoduo/config.h

@@ -45,6 +45,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 /* ws2812 RGB LED */
 #define RGB_DI_PIN D4
+#if !defined(RGBLED_NUM)
+#    define RGBLED_NUM 18
+#    define RGBLIGHT_SPLIT
+#    define RGBLED_SPLIT { 9, 9 }
+// Switch RGB sides with LED MAP.
+#    define RGBLIGHT_LED_MAP { 8, 7, 6, 5, 4, 3, 2, 1, 0, 17, 16, 15, 14, 13, 12, 11, 10, 9}
+#    define RGBLIGHT_LAYERS
+#endif
 #define RGBLIGHT_ANIMATIONS
 #define RGBLIGHT_SLEEP
 #define RGBLIGHT_HUE_STEP 16