* At least the F_CPU define in host mock.h is needed by host Arduino.h - need to include Arduino.h further down in mock.h for this to work.
* Geting the include order right
* Prepare for runtime CPU clock rate selection
* Fix compile for not defined F_CPU
If defined F_CPU, make getCpuFreqMHz() a constexpr
* Use defines for register CPU2X instead of hex value
* Fix build for host - getCpuFreqMHz there was also in conflict with getCycleCount, using F_CPU:
tests/host/common/mock.h:#define F_CPU 80000000 (!)
* Asymmetrical includes and defines on host
* Support restart switch from 160MHz to 80MHz, e.g for OTA. Fixes#579
6cb16997d8