zephyr: dropped __BOOTSIM__ ifdef-ry from the port

Since #1383 the configuration translation header and
the logging translation header are not used by the simiulator.

Thanks to that __BOOTSIM__ dependence might be removed - what is done
in this patch.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>