Updated constants for Beagle Nixie Rev 2

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Swap DATA and CLK pins for rev2

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Add EEPROM generation script for Nixie Cape

Signed-off-by: Matt Ranostay <mranostay@gmail.com>