lib: Add tinyusb as a submodule.

dpgeorge · dpgeorge · commit 258d10862df4 · 2019-07-01T17:18:44.000+10:00
diff --git a/.gitmodules b/.gitmodules
@@ -24,3 +24,6 @@
 [submodule "lib/asf4"]
 	path = lib/asf4
 	url = https://github.com/adafruit/asf4
+[submodule "lib/tinyusb"]
+	path = lib/tinyusb
+	url = https://github.com/hathach/tinyusb
diff --git a/lib/tinyusb b/lib/tinyusb
@@ -0,0 +1 @@
+Subproject commit 393492823ce037a2e46d367d61fad1235859af2e
