The cycloneV has three gpio controllers, each one with 29 gpios. This patch
adds the three controller with the gpio driver which is now sitting the
gpio tree.

Cc: devicetree@vger.kernel.org
Acked-by: NAlan Tull <atull@altera.com>
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NDinh Nguyen <dinguyen@altera.com>