usb: device: class: rndis: correct IAD and IF0 descriptors

Use descriptors as dictated by Microsoft and USB-IF.
That allows the RNDIS device to be correctly detected on Windows.

* Microsoft: https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/supported-usb-classes
* USB-IF Defined Class Codes: https://www.usb.org/defined-class-codes

Signed-off-by: Georgij Cernysiov <geo.cgv@gmail.com>
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