[arch][arm] add lk.elf.stack to the generated list so it gets removed in the clean target
[arch][arm] add lk.elf.stack to the generated list so it gets removed in the clean target

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