T4.x RAWHID remove compiler warning.

usb.c did not include the usb_rawhid.h so it would give a compiler warning about having to create a ...

teensy4/usb.c

@@ -3,6 +3,7 @@
 #include "usb_desc.h"
 #include "usb_serial.h"
 #include "usb_seremu.h"
+#include "usb_rawhid.h"
 #include "usb_keyboard.h"
 #include "usb_mouse.h"
 #include "usb_joystick.h"