update linux kernel to 4.19.56-linux4sam-6.1, which support Kernel crypto u...

guowenxue

2019-08-26 912f9e0ee8303384e42bbe9626cf5a2684143696

linux-bsp/tarballs/linux-at91.tar.xz does not exist in tree bd5bfcc202aeb756bc5b9f3e0cf1ce9f2c01bc82