Enable the commented out PCF8523 RTC support for Hummingboard pro
base boards.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>