Add core/fallback encoder behaviour (#20320)

keyboards/pica40/rev1/rev1.c

@@ -77,15 +77,3 @@ bool oled_task_kb(void) {
 }
 
 #endif // OLED_ENABLE
-
-#ifdef ENCODER_ENABLE
-
-bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!encoder_update_user(index, clockwise)) return false;
-
-    tap_code(clockwise ? KC_VOLU : KC_VOLD);
-
-    return false;
-}
-
-#endif // ENCODER_ENABLE