compulab: eeprom: add default eeprom bus

Add default eeprom bus setting.
This addresses the trimslice compile error that was introduced
with the addition of this setting.

Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>