drivers/rtc/rtc-as3722: add RTC driver

The ams AS3722 is a compact system PMU suitable for mobile phones, tablets
etc.

Add a driver to support accessing the RTC found on the ams AS3722 PMIC
using RTC framework.

[[email protected]: coding-style fixes]
Signed-off-by: Laxman Dewangan <[email protected]>
Signed-off-by: Florian Lobmaier <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Linus Walleij <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
3 files changed