Remove unneeded apps from build
Build NuttX optimized for size
Board drivers: Optimize for size
STM32 drivers: Optimize for size
FMU driver: optimize for size
Sensors: Optimize for size
Systemlib: Optimize for size
Merge branch 'sizeopt' into silicon_mitigation
Optimize size of system lib
airspeed driver: Be less chatty
ARDrone driver: be less chatty
FrSky: Be less chatty
HIL: Be less chatty
HoTT: Less chatty
Bottle drop: Less chatty
Airspeed: less chatty
Controllib: Optimize for size
uORB: Save space, does not do complex operations
Merge pull request #1456 from PX4/silicon_mitigation

Squeeze flash size below 1MB
Merge pull request #2 from PX4/master

Update