eeprom: Update to v2

novena-eeprom now reads and writes version 2 of the EEPROM mapping.  This
allows for more expressive definition of modelines, and adds more features.

Signed-off-by: Sean Cross <xobs@kosagi.com>
novena-eeprom: Add manpage

This documents just about everything in the program.

Signed-off-by: Sean Cross <xobs@kosagi.com>