Mynewt 1.8 release upgrade

[ncasaril]

Go through bsps and code that is affected by the new mynewt release.

• BSP up to speed with how the latest way of writing them in 1.8, they may have lagged behind
• Look at making bus-master drivers available in bsps
• Console and shell api's still the same?
• Do we need to update the dpl porting layer to match new os_* apis?
• newtmgr is now smp

[szymon-czapracki]

@ncasaril Is there an option to unassign me from this :) (doing some spring cleanups :P )

[ncasaril]

@ncasaril Is there an option to unassign me from this :) (doing some spring cleanups :P )

All done :)