net/mac: fix bug
net/mac: fix bug

fixes bug in ethernetif.c
it used a wrong macro

Change-Id: Ife37edc5b1e591c2c829e61af8213166c31fac41
Signed-off-by: jisuu.kim <800dec47d2987cee7cc3d7aee71bc11b56f5042e@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT