Add add sama5d4_xplained-Loader.zip in tools folder

guowenxue

2019-08-22 f81d144c263e0a368524ae46bd49e3546f01ccdc

linux-bsp/tarballs/linux-at91.tar.xz does not exist in tree cc9a6fdc7ea09bfb05279e2a7bd7e274842516ae