ARC: ARCv3: add qemu HS6x board

Add QEMU board with single core ARCv3 HS6x 64 bit CPU

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Evgeniy Paltsev <PaltsevEvgeniy@gmail.com>
9 files changed