Add core/fallback encoder behaviour (#20320)

keyboards/atlantis/ps17/ps17.c

@@ -19,23 +19,6 @@ void keyboard_pre_init_kb(void) {
     keyboard_pre_init_user();
 }
 
-#if defined(ENCODER_ENABLE)
-bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!encoder_update_user(index, clockwise)) {
-        /* Don't process further events if user function exists and returns false */
-        return false;
-    }
-
-    /* Ignore index - only one encoder on this board */
-    if (clockwise) {
-        tap_code_delay(KC_VOLU, 10);
-    } else {
-        tap_code_delay(KC_VOLD, 10);
-    }
-    return false;
-}
-#endif
-
 #ifdef RGB_MATRIX_ENABLE
 void suspend_power_down_kb(void) {
     /* Disable indicator LEDs when going to sleep */