Remove submodule USB_Host_Shield_2.0

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "protocol/usb_hid/USB_Host_Shield_2.0"]
-	path = protocol/usb_hid/USB_Host_Shield_2.0
-	url = git@github.com:tmk/USB_Host_Shield_2.0.git
 [submodule "protocol/lufa/LUFA-git"]
 	path = protocol/lufa/LUFA-git
 	url = https://github.com/abcminiuser/lufa.git

protocol/usb_hid/USB_Host_Shield_2.0

@@ -1 +0,0 @@
-Subproject commit 8bb790f83af298b5f3e5516259c9d8ec27efe522