bpf: Initialize the bpf_run_ctx in bpf_iter_run_prog()

The bpf-iter-prog for tcp and unix sk can do bpf_setsockopt()
which needs has_current_bpf_ctx() to decide if it is called by a
bpf prog.  This patch initializes the bpf_run_ctx in
bpf_iter_run_prog() for the has_current_bpf_ctx() to use.

Acked-by: Andrii Nakryiko <[email protected]>
Reviewed-by: Stanislav Fomichev <[email protected]>
Signed-off-by: Martin KaFai Lau <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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