doc: boards/arduino_101: Update BLE firmare for latest MyNewt version

The dependencies for the HCI firmware are now part of the latest
stable MyNewt release, so special editing of project.yml is no longer
needed.

Change-Id: Ia3658ab1da03e208cd5230e0cda4c96a4628e8f0
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>