update linux-at91 to 4.9.151-linux4sam_5.8 and patch for SPI,RT5370, update...

guowenxue

2019-08-22 cff7933fa135fc184e4909aaae171463139884ed

linux-bsp/tarballs/linux-at91.tar.xz does not exist in tree fbc17cc09a5f2aaebcf483afe798b13ae754e8bd