gem5: fix arm multicore with system.auto_reset_addr = True

baremetal: fix aarch64/no_bootloader/semihost_exit.S which was wrong
because was using unset sp for register block. Tests needed urgently!!

run-toolchain

@@ -35,7 +35,7 @@ parser.add_argument(
     nargs='*'
 )
 args = common.setup(parser)
-if args.baremetal is None:
+if common.baremetal is None:
     image = common.vmlinux
 else:
     image = common.image