bpf: Factor out socket lookup functions for the TC hookpoint.

Change BPF helper socket lookup functions to use TC specific variants:
bpf_tc_sk_lookup_tcp() / bpf_tc_sk_lookup_udp() / bpf_tc_skc_lookup_tcp()
instead of sharing implementation with the cg / sk_skb hooking points.
This allows introducing a separate logic for the TC flow.

The tc functions are identical to the original code.

Signed-off-by: Gilad Sever <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Shmulik Ladkani <[email protected]>
Reviewed-by: Eyal Birger <[email protected]>
Acked-by: Stanislav Fomichev <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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