novena-ramtune: Remove config file
peripherals: Bring up board-specific peripherals

Different boards might have differeht peripherals populated.  We
now query the personality EEPROM at boot, and enable peripherals
that exist on the board.  Any peripherals that don't exist will not
be initialized.

Normally this involves setting a device tree node from "disabled" to
"okay", but occasionally we need to do something more.  For example,
the gigabit ethernet peripheral will pull its MAC from the EEPROM.