layer.conf: Remove obsolete entries
layer.conf: Remove obsolete entries

The bsp layer we use now correctly sets these in the machine conf file
so there is no need for them here also.

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

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