dt-overlay-at91: bump to linux4sam-2020.10 tag
dt-overlay-at91: bump to linux4sam-2020.10 tag

Signed-off-by: Nicolas Ferre <45b517be0e5ec6dc3a39715767c1d18e090d39b4@microchip.com>

linux4sam/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel