staging: emxx_udc: Add TODO file

Add a TODO file for emxx_udc to show what is left to do.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/emxx_udc/TODO

+* add clock framework support (platform device with CCF needs special care)
+* break out board-specific VBUS GPIO to work with multiplatform
+* DT bindings
+* move driver into drivers/usb/gadget/