net/ethernet: Fix mac address setting through ethernet mgmt
net/ethernet: Fix mac address setting through ethernet mgmt

Attributes passed to memcpy were inverted so the mac was always getting
set to all zeroes.

Signed-off-by: Tomasz Gorochowik <265c7c25eca9aa9127910457b0aea7e793d329f1@antmicro.com>

zephyrproject-rtos/zephyr,mbolivar/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,explora26/zephyr,explora26/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,finikorg/zephyr,zephyriot/zephyr,ldts/zephyr,finikorg/zephyr,mbolivar/zephyr,explora26/zephyr,punitvara/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,nashif/zephyr,mbolivar/zephyr,ldts/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,punitvara/zephyr,punitvara/zephyr,punitvara/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,Vudentz/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,mbolivar/zephyr,Vudentz/zephyr,zephyriot/zephyr,kraj/zephyr,nashif/zephyr,explora26/zephyr,zephyriot/zephyr,zephyriot/zephyr,Vudentz/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,mbolivar/zephyr,zephyriot/zephyr,kraj/zephyr,galak/zephyr,galak/zephyr,explora26/zephyr,finikorg/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr