at91bootstrap: add sam9x60ek compatibility to 3.9.0
at91bootstrap: add sam9x60ek compatibility to 3.9.0

Signed-off-by: Razvan Stefanescu <f4ee3fcb6e54dcf71fbaefdd500eea5cee1f4f99@microchip.com>

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