[platform][stm32f7xx] make mac address different than eval2
[platform][stm32f7xx] make mac address different than eval2

minglun-tsai/lk,srodrig1/lk,littlekernel/lk,skabet/lk,srodrig1/lk,nvll/lk,travisg/lk,skabet/lk,littlekernel/lk,hollanderic/lkstuff,hollanderic/lkstuff,srodrig1/lk,travisg/lk,sndnvaps/lk,skabet/lk,minglun-tsai/lk,sndnvaps/lk,littlekernel/lk,minglun-tsai/lk,minglun-tsai/lk,nvll/lk,ErikCorryGoogle/lk,srodrig1/lk,nvll/lk,hollanderic/lkstuff,sndnvaps/lk,skabet/lk,nvll/lk,skabet/lk,hollanderic/lkstuff,travisg/lk,travisg/lk,ErikCorryGoogle/lk,srodrig1/lk,nvll/lk,littlekernel/lk,sndnvaps/lk,ErikCorryGoogle/lk,sndnvaps/lk,ErikCorryGoogle/lk