Looking over the current boards, there are no users of
CONFIG_MAC_ADDR_IN_EEPROM. Further, omapl138_lcdk uses
CONFIG_NET_RANDOM_ETHADDR. Drop various unused code paths.
Cc: Adam Ford <aford173@gmail.com>
Cc: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tom Rini <trini@konsulko.com>