sandbox: Allow -c argument to provide a command list

This allows passing of entire scripts to sandbox with the -c argument,
which is useful for testing. Commands can be delimited with a newline
or semicolon.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/start.c

@@ -90,7 +90,7 @@ int sandbox_main_loop_init(void)
 
 	/* Execute command if required */
 	if (state->cmd) {
-		run_command(state->cmd, 0);
+		run_command_list(state->cmd, -1, 0);
 		os_exit(state->exit_type);
 	}