overlay: change storage location to /storage/sdcard0

Change-Id: Id2314e05a29b252aa73d2fd0e1fb875beaa4bbb4
diff --git a/overlay/frameworks/base/core/res/res/xml/storage_list.xml b/overlay/frameworks/base/core/res/res/xml/storage_list.xml
index 043530d..0a03928 100644
--- a/overlay/frameworks/base/core/res/res/xml/storage_list.xml
+++ b/overlay/frameworks/base/core/res/res/xml/storage_list.xml
@@ -33,7 +33,7 @@
 -->
 
 <StorageList xmlns:android="http://schemas.android.com/apk/res/android">
-    <storage android:mountPoint="/mnt/sdcard"
+    <storage android:mountPoint="/storage/sdcard0"
              android:storageDescription="@string/storage_internal"
              android:primary="true"
              android:emulated="true"