Add support for the RTC unit on Ingenic JZ4740, JZ475x and JZ477x SoCs.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Antony Pavlov authored on 29 Jul 2014 Sascha Hauer committed on 2 Aug 2014