Reduce /storage permissions to 0050.

Bug: 6346248
Change-Id: I15c60f40533e08804f4a9b7e262c6bb6f28d24b4
diff --git a/init.omap4pandaboard.rc b/init.omap4pandaboard.rc
index 125e0fe..8c8b28f 100644
--- a/init.omap4pandaboard.rc
+++ b/init.omap4pandaboard.rc
@@ -2,7 +2,7 @@
 
 on early-init
     export EXTERNAL_STORAGE /storage/sdcard0
-    mkdir /storage 0550 system sdcard_r
+    mkdir /storage 0050 system sdcard_r
     mkdir /storage/sdcard0 0000 system system
     # for backwards compatibility
     symlink /storage/sdcard0 /sdcard