Bring back ADB_EXTERNAL_STORAGE.

Bug: 7119408
Change-Id: I14aa89cd0ba8bc79a5641778205f6fc08154fc04
diff --git a/init.omap4pandaboard.rc b/init.omap4pandaboard.rc
index 91c3842..eb9bdf4 100644
--- a/init.omap4pandaboard.rc
+++ b/init.omap4pandaboard.rc
@@ -6,6 +6,7 @@
     mkdir /storage/sdcard0 0000 root root
 
     export EXTERNAL_STORAGE /storage/sdcard0
+    export ADB_EXTERNAL_STORAGE /mnt/shell/sdcard0/0
     export MULTIUSER_EXTERNAL_STORAGE /mnt/shell/sdcard0
 
     # Support legacy paths