linux-at91: Add support for config fragments
linux-at91: Add support for config fragments

The config fragments can be used to enable or disable certain kernel
features. To use kernel fragments, add files with *.cfg in SRC_URI.

Signed-off-by: Codrin Ciubotariu <97034fe81dd68ee5e1fa3aa6216f6373b034daef@microchip.com>

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