usb: sort usb config data by section

USBD_CFG_DATA_DEFINE macro has not consider that a class
could have more than one set of usb_cfg_data struct.
If a class has more than one set of usb_cfg_data
then they should be sorted the same way like by
USBD_DEVICE_DESCR_DEFINE macro.

Fixes: #16240

Signed-off-by: Johann Fischer <j.fischer@phytec.de>