bpf: lsm: Add selftests for BPF_PROG_TYPE_LSM

* Load/attach a BPF program that hooks to file_mprotect (int)
  and bprm_committed_creds (void).
* Perform an action that triggers the hook.
* Verify if the audit event was received using the shared global
  variables for the process executed.
* Verify if the mprotect returns a -EPERM.

Signed-off-by: KP Singh <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Brendan Jackman <[email protected]>
Reviewed-by: Florent Revest <[email protected]>
Reviewed-by: Thomas Garnier <[email protected]>
Reviewed-by: James Morris <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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