Revert "abb-ponkey: add API for POnKey emulator"

This reverts commit dc6dcfa54bf62cd7af144debe7e94e68af6b7381.
Revert "abb-POnKey: Implement PowerOn Key emulator"

This reverts commit f6b5b1d6e4ae754bcb3bebee0b1c76f3e1b748bd.