Remove all references to the lockdown class from SELinux policy

A comprehensive fix for all the problems caused by the lockdown SELinux
class was rejected by Linus and for the lack of a better option,
the consensus upstream was to just remove the class entirely and stop
checking anything in the lockdown hook.

This commit is a follow-up to selinux-policy commit
12f821c731b2 ("Remove the lockdown-class rules from the policy").

src/selinux/pcp.te

@@ -519,15 +519,6 @@ optional_policy(`
     allow pcp_pmcd_t syslogd_var_run_t:file { map };
 ')
 
-optional_policy(`
-    require {
-	class lockdown { integrity };
-    }
-    # pmda.kvm
-    # type=AVC msg=audit(YYY.101): avc: denied { integrity } for pid=PID comm="pmdakvm" lockdown_reason="debugfs access" scontext=system_u:system_r:pcp_pmcd_t:s0 tcontext=system_u:system_r:pcp_pmcd_t:s0 tclass=lockdown permissive=0
-    allow pcp_pmcd_t self:lockdown integrity;
-')
-
 optional_policy(`
     require {
 	class rawip_socket { create getopt setopt read write };