Revert "bpf: Emit audit messages upon successful prog load and unload"

This commit reverts commit 91e6015b ("bpf: Emit audit messages
upon successful prog load and unload") and its follow up commit
7599a896 ("audit: Move audit_log_task declaration under
CONFIG_AUDITSYSCALL") as requested by Paul Moore. The change needs
close review on linux-audit, tests etc.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>