perf: Remove unnecessary parameter of security check

It seems that the attr parameter was never been used in security
checks since it was first introduced by:

commit da97e184 ("perf_event: Add support for LSM and SELinux checks")

so remove it.

Signed-off-by: Luo Gengkun <luogengkun@huaweicloud.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>