bpf: Restore behaviour of CAP_SYS_ADMIN allowing the loading of networking bpf programs

This is a fix for a regression in commit 2c78ee898d8f ("bpf: Implement CAP_BPF").
Before the above commit it was possible to load network bpf programs
with just the CAP_SYS_ADMIN privilege.

The Android bpfloader happens to run in such a configuration (it has
SYS_ADMIN but not NET_ADMIN) and creates maps and loads bpf programs
for later use by Android's netd (which has NET_ADMIN but not SYS_ADMIN).

Fixes: 2c78ee898d8f ("bpf: Implement CAP_BPF")
Reported-by: John Stultz <[email protected]>
Signed-off-by: Maciej Żenczykowski <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Tested-by: John Stultz <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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