net: usb: pegasus: enable basic endpoint checking

In the Linux kernel, the following vulnerability has been resolved:

net: usb: pegasus: enable basic endpoint checking

pegasus_probe() fills URBs with hardcoded endpoint pipes without

verifying the endpoint descriptors:

- usb_rcvbulkpipe(dev, 1) for RX data

- usb_sndbulkpipe(dev, 2) for TX data

- usb_rcvintpipe(dev, 3) for status interrupts

A malformed USB device can present these endpoints with transfer types

that differ from what the driver assumes.

Add a pegasus_usb_ep enum for endpoint numbers, replacing magic

constants throughout. Add usb_check_bulk_endpoints() and

usb_check_int_endpoints() calls before any resource allocation to

verify endpoint types before use, rejecting devices with mismatched

descriptors at probe time, and avoid triggering assertion.

Similar fix to

- commit 90b7f2961798 ("net: usb: rtl8150: enable basic endpoint checking")

- commit 9e7021d2aeae ("net: usb: catc: enable basic endpoint checking")