flow_dissector: do not dissect PPPoE PFC frames

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CVE-2026-46306

In the Linux kernel, the following vulnerability has been resolved: flowdissector: do not dissect PPPoE PFC frames RFC 2516 Section 7 states that Protocol Field Compression PFC is NOT RECOMMENDED for PPPoE. In practice, pppd does not support negotiating PFC for PPPoE sessions, and the flow...