kernel-resin.bbclass: Add docker aufs config dependencies instead of btrfs ones.
kernel-resin.bbclass: Add docker aufs config
dependencies instead of btrfs ones.

We will start to use aufs as docker storage driver with ext4 as
backing filesystem instead of btrfs.

Signed-off-by: Florin Sarbu <3a837a37a2ac9072a088641ec330e0e5d5b86f4e@resin.io>

resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin