Revert securitfs change

Commit 5e60145 use findmnt with "--source" or "--target" broke
mounting securityfs.  This patch reverts only the securityfs
portion of the patch.

modules.d/96securityfs/securityfs.sh

@@ -3,6 +3,6 @@
 SECURITYFSDIR="/sys/kernel/security"
 export SECURITYFSDIR
 
-if ! findmnt --target "${SECURITYFSDIR}" >/dev/null 2>&1; then
+if ! findmnt "${SECURITYFSDIR}" >/dev/null 2>&1; then
    mount -t securityfs -o nosuid,noexec,nodev securityfs ${SECURITYFSDIR} >/dev/null 2>&1
 fi