This patch removes TOPDIR from Cris Makefiles.

Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Andreas Schwab <schwab@suse.de>
Signed-off-by: NWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>