Remove quantum.h includes from keyboard custom matrix.cs (#23371)

keyboards/ibm/model_m/mschwingen/matrix.c

@@ -14,12 +14,9 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#include <stdint.h>
-#include <stdbool.h>
 #include "util.h"
 #include "matrix.h"
 #include "debounce.h"
-#include "quantum.h"
 #include "spi_master.h"
 #include "print.h"
 #include "mschwingen.h"