The concept of a safe mode recovery.bin bootloader was dropped in favour
of a recovery.bin which renames itself after updating the EEPROM. Remove
the old comments.
Function does not necessarily check for latest version. Also, it does not actually get the update, just the version, so rename function to 'getUpdateVersion' to match 'getCurrentVersion'. Similarly with 2 variable names.
* Use vcgencmd otp_dump to get the board-revision because the format
is predictable.
* Change the -f completion message to indicate that the update is
scheduled rather than complete.
* Add some notes to help about the update mechanism.
