This commit : - bumps Linux & U-Boot to linux4sam_6.0. - bumps at91bootstrap to v3.8.12. - removes old in-tree dts (now in dt-overlay-at91 [1][2]) - adapts genimage accordingly. [1] https://github.com/linux4sam/dt-overlay-at91/tree/master/sama5d27_som1_ek [2] http://www.at91.com/linux4sam/bin/view/Linux4SAM/DT-Overlay Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>