[arch][x86-64] add nulled out arch_sync_cache_range
[arch][x86-64] add nulled out arch_sync_cache_range

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