mx51evk: Add RTC support

MX51EVK has a MC13892 PMIC. Add RTC support.

Tested via 'date' command that reads the PMIC RTC registers:

MX51EVK U-Boot > date
Date: 1970-01-01 (Thursday)    Time:  0:40:35

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
1 file changed