at91bootstrap: add 3.9.1 recipe
at91bootstrap: add 3.9.1 recipe

Use v3.9.1-rc1 tag.

Signed-off-by: Cristian Birsan <0cb032615d2842358b4a8e1daa5f1b3e6f635525@microchip.com>
[97034fe81dd68ee5e1fa3aa6216f6373b034daef@microchip.com: COMPATIBLE_MACHINE with sama5d2-icp-sd only]
Signed-off-by: Codrin Ciubotariu <97034fe81dd68ee5e1fa3aa6216f6373b034daef@microchip.com>

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