bpf: Use bpf_capable() instead of CAP_SYS_ADMIN for blinding decision

The full CAP_SYS_ADMIN requirement for blinding looks too strict nowadays.
These days given unprivileged BPF is disabled by default, the main users
for constant blinding coming from unprivileged in particular via cBPF -> eBPF
migration (e.g. old-style socket filters).

Signed-off-by: Yauheni Kaliuta <ykaliuta@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220831090655.156434-1-ykaliuta@redhat.com
Link: https://lore.kernel.org/bpf/20220905090149.61221-1-ykaliuta@redhat.com

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