Add directories for OBB mounting

Change-Id: Ib73e9bca50fb168ab5d147cc260666a770092961

rootdir/init.rc

@@ -16,6 +16,7 @@ loglevel 3
     export ANDROID_DATA /data
     export EXTERNAL_STORAGE /mnt/sdcard
     export ASEC_MOUNTPOINT /mnt/asec
+    export LOOP_MOUNTPOINT /mnt/obb
     export BOOTCLASSPATH /system/framework/core.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar
 
 # Backward compatibility
@@ -53,6 +54,10 @@ loglevel 3
     mkdir /mnt/asec  0700 root system
     mount tmpfs tmpfs /mnt/asec mode=0755,gid=1000
 
+    # Filesystem image public mount points.
+    mkdir /mnt/obb 0700 root system
+    mount tmpfs tmpfs /mnt/obb mode=0755,gid=1000
+
     mount rootfs rootfs / ro remount
 
     write /proc/sys/kernel/panic_on_oops 1