add tinyusb for m4 airlift lite

Author: brentru

build_platform.py

@@ -77,6 +77,7 @@
     "metro_m4" : "adafruit:samd:adafruit_metro_m4:speed=120",
     "metro_m4_tinyusb" : "adafruit:samd:adafruit_metro_m4:speed=120,usbstack=tinyusb",
     "metro_m4_airliftlite" : "adafruit:samd:adafruit_metro_m4_airliftlite:speed=120",
+    "metro_m4_airliftlite_tinyusb" : "adafruit:samd:adafruit_metro_m4_airliftlite:speed=120,usbstack=tinyusb",
     "pybadge" : "adafruit:samd:adafruit_pybadge_m4:speed=120",
     "pybadge_tinyusb" : "adafruit:samd:adafruit_pybadge_m4:speed=120,usbstack=tinyusb",
     "pygamer" : "adafruit:samd:adafruit_pygamer_m4:speed=120",