[Keyboard] Add keyboard level encoder function for GMMK Pro (#16721)

keyboards/gmmk/pro/pro.c

@@ -14,3 +14,17 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include "pro.h"
+
+#ifdef ENCODER_ENABLE
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!encoder_update_user(index, clockwise)) {
+        return false;
+    }
+    if (clockwise) {
+        tap_code_delay(KC_VOLU, 10);
+    } else {
+        tap_code_delay(KC_VOLD, 10);
+    }
+    return false;
+}
+#endif