Make 'run' use run_command_list() instead of run_command()

In the case where an environment variable spans multiple lines, we should
use run_command_list() so that all lines are executed. This shold be
backwards compatible with existing behaviour for existing scripts.

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

common/main.c

@@ -1550,7 +1550,7 @@ int do_run (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 			return 1;
 		}
 
-		if (run_command(arg, flag) != 0)
+		if (run_command_list(arg, -1, flag) != 0)
 			return 1;
 	}
 	return 0;