lvm/lvm_scan.sh: remove references to lvm-cleanup

lvm-cleanup was removed long time ago

modules.d/90lvm/lvm_scan.sh

@@ -120,7 +120,5 @@ fi
 
 if [ "$lvmwritten" ]; then
     rm -f /etc/lvm/lvm.conf
-    ln -s $(command -v lvm-cleanup) $hookdir/pre-pivot/30-lvm-cleanup.sh 2>/dev/null
-    ln -s $(command -v lvm-cleanup) $hookdir/pre-pivot/31-lvm-cleanup.sh 2>/dev/null
 fi
 unset lvmwritten