Clean up usage of QMK_KEYBOARD_H (#20167)

keyboards/converter/sun_usb/led.c

@@ -15,7 +15,8 @@ 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 QMK_KEYBOARD_H
+#include "led.h"
+#include "print.h"
 #include "uart.h"
 
 void led_set(uint8_t usb_led)