net: export eth_setenv_enetaddr_by_index() to net.h

Some TI boards (e.g. IDK) have 4 to 6 ethernet ports and
this function is handy at board.c to configure the
MAC address of the ports.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
1 file changed