usb: device_next: check wIndex on Set Address

Set Address behavior is not specified when wValue is greater than 127,
or if wIndex or wLength are non-zero. USB stack did check wValue and
wLength but didn't care about wIndex value. Extend the check so non-zero
wIndex also results in STALL response.

Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>