rtc: s3c: add s3c_rtc_data structure to use variant data instead of s…

…3c_cpu_type

Add s3c_rtc_data structure to variant data according to SoC type.  The
s3c_rtc_data structure includes some functions to control RTC operation
and specific data dependent on SoC type.

Signed-off-by: Chanwoo Choi <[email protected]>
Acked-by: Kyungmin Park <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Kukjin Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>