UBUNTU: [Config] set CONFIG_BPF_UNPRIV_DEFAULT_OFF=y

UBUNTU: [Config] set CONFIG_BPF_UNPRIV_DEFAULT_OFF=y

This option will disable uprivileged BPF by default. It can be reenabled,
though, as it uses the new value 2 for the kernel.unprivileged_bpf_disabled
sysctl. That value disables it, but allows the sysctl knob to be set back
to 0.

This allows sysadmins to enable unprivileged BPF back by using sysctl
config files.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>