Add OMAP RTC driver

Adds OMAP RTC driver.

Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --cc drivers/char/Kconfig
Simple merge

diff --cc drivers/char/Makefile
Simple merge

diff --cc drivers/char/omap-rtc.c
Simple merge

diff --cc drivers/char/omap-rtc.h
Simple merge