Native USB Host device failures

[gdsports]

There are four USB devices that fail on the Zero native USB port but work on Due. The MouseController and KeyboardController examples are used for testing.

                                Due     Zero    Zero-patch
                                ===     ====    ==========
Logitech Marble mouse           Pass    Fail    Pass
Generic no-name mouse           Pass    Pass    Pass

The non-keyboard devices emulate USB keyboards.

                                Due     Zero    Zero-patch
                                ===     ====    ==========
Generic Barcode reader          Pass    Fail    Pass
Generic RFID reader small       Pass    Fail    Pass
Generic RFID reader large       Pass    Fail    Pass
Generic Numeric keypad          Pass    Pass    Pass
Generic 101 Keyboard            Pass    Pass    Pass

[sandeepmistry]

Closed via #343.