Add driver for RTC in Sunplus SP7021
Signed-off-by: NVincent Shih <vincent.sunplus@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1638517579-10316-2-git-send-email-vincent.sunplus@gamil.com