Revert "libaudit: limit to 5 selinux denials per sec"

The shamu instabilities continued even after throttling SELinux denials
to 5/second. 5 denials per second is too low when doing device bringup,
and there have been some complaints about lost SELinux denials. See,
for example, http://comments.gmane.org/gmane.comp.security.selinux/21941

Bring the limit back up to 20/second to prevent dropping too many
denials on the floor.

This reverts commit a15db51bbf961ff711d71c10d20e18ad2bfaef45.

Change-Id: I05e85cce0a792d05aa557fcc614c0fc019c15014
diff --git a/logd/libaudit.c b/logd/libaudit.c
index cf76305..d00d579 100644
--- a/logd/libaudit.c
+++ b/logd/libaudit.c
@@ -177,7 +177,7 @@
      */
     status.pid = pid;
     status.mask = AUDIT_STATUS_PID | AUDIT_STATUS_RATE_LIMIT;
-    status.rate_limit = 5; // audit entries per second
+    status.rate_limit = 20; // audit entries per second
 
     /* Let the kernel know this pid will be registering for audit events */
     rc = audit_send(fd, AUDIT_SET, &status, sizeof(status));