layer.conf: Remove preference for kernel version 3.10
layer.conf: Remove preference for kernel version 3.10

We are now using kernel 4.13.0 instead

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

resin-os/resin-edison,resin-os/resin-edison,resin-os/resin-edison