add data directory skeleton support

board/common/overlay/etc/init.d/S00datapart

@@ -43,9 +43,7 @@ case "$1" in
         test $? == 0 && msg_done || msg_fail
 
         msg_begin "Creating required data files"
-        mkdir /data/etc
-        mkdir /data/log
-        mkdir -m 775 /data/media
+        cp -pur /usr/share/dataskel/* /data
         cp /etc/version /data/etc/version
         ln -s /usr/share/zoneinfo/UTC /data/etc/localtime
         touch /data/etc/adjtime