p350: remove wallpaper_info.xml

W/WallpaperService( 1787): failed parsing /data/system/users/0/wallpaper_info.xml java.io.FileNotFoundException: /data/system/users/0/wallpaper_info.xml: open failed: ENOENT (No such file or directory)

Change-Id: If2d2ac7de1ddb8bd5349d120e2ce4e9fde8ed1cf