overlay: Add LVM init script

Scan for any available logical volumes on boot.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/overlay/etc/init.d/S18lvm b/openpower/overlay/etc/init.d/S18lvm
new file mode 100755
index 0000000..043e846
--- /dev/null
+++ b/openpower/overlay/etc/init.d/S18lvm
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+case "$1" in
+	start)
+		logger "Scanning for LVM volumes"
+		/usr/sbin/vgscan
+		/usr/sbin/vgchange -ay
+		;;
+	stop)
+		logger "Stopping LVM volumes"
+		/usr/sbin/vgchange -an
+		;;
+	restart|force-reload)
+		;;
+esac
+
+exit 0