Clean up usage of QMK_KEYBOARD_H (#20167)

keyboards/gboards/gergo/matrix.c

@@ -17,16 +17,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "matrix.h"
-#include <stdint.h>
-#include <stdbool.h>
-#include <avr/io.h>
 #include "wait.h"
-#include "action_layer.h"
-#include "print.h"
 #include "debug.h"
 #include "util.h"
 #include "debounce.h"
-#include QMK_KEYBOARD_H
+#include "gergo.h"
 
 #ifdef BALLER
 #include <avr/interrupt.h>