u-boot-at91: add support for sama5d2 and sd machines
u-boot-at91: add support for sama5d2 and sd machines

Signed-off-by: Ludovic Desroches <627575320a9526cb6c91021c9940202b0e84c416@atmel.com>

alexandrebelloni/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel,kraj/meta-atmel,kraj/meta-atmel,kraj/meta-atmel,linux4sam/meta-atmel,linux4sam/meta-atmel,alexandrebelloni/meta-atmel,alexandrebelloni/meta-atmel