Add HS toolchain support in HelloARC

1:No errors when changing toolchain
2:Both support EM/HS in Hellwo world project, but EM toolchain will create
HS settings --undone problem
3:Can compile current project after chaning toolchain --undone problem

Signed-off-by: Yunlu Zhang <Yunlu.Zhang@synopsys.com>
Support both EM/HS Hello projects

Signed-off-by: Yunlu Zhang <Yunlu.Zhang@synopsys.com>