Add Support for USB programmable buttons (#12950)

quantum/keyboard.c

@@ -76,6 +76,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef JOYSTICK_ENABLE
 #    include "process_joystick.h"
 #endif
+#ifdef PROGRAMMABLE_BUTTON_ENABLE
+#    include "programmable_button.h"
+#endif
 #ifdef HD44780_ENABLE
 #    include "hd44780.h"
 #endif
@@ -542,6 +545,10 @@ MATRIX_LOOP_END:
     digitizer_task();
 #endif
 
+#ifdef PROGRAMMABLE_BUTTON_ENABLE
+    programmable_button_send();
+#endif
+
     // update LED
     if (led_status != host_keyboard_leds()) {
         led_status = host_keyboard_leds();