ccid_usb: Simplify get_end_points/get_endpoints #132
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The (unique) caller of get_endpoints already has a pointer to usb_interface. Just pass that to get_endpoints directly instead of calling get_ccid_usb_interface again.
The caller of get_data_rates already has a copy of the device decriptor. No need to call get_ccid_device_descriptor(get_ccid_usb_interface(desc, &num)) again.
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The caller already has the structures/data ready, so let's not make superfluous calls to
get_ccid_*functions.