LSM: Convert security_initcall() into DEFINE_LSM()

Instead of using argument-based initializers, switch to defining the
contents of struct lsm_info on a per-LSM basis. This also drops
the final use of the now inaccurate "initcall" naming.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Signed-off-by: James Morris <james.morris@microsoft.com>

security/smack/smack_lsm.c

@@ -4882,4 +4882,6 @@ static __init int smack_init(void)
  * Smack requires early initialization in order to label
  * all processes and objects when they are created.
  */
-security_initcall(smack_init);
+DEFINE_LSM(smack) = {
+	.init = smack_init,
+};