RTC for 6.6

Subsystem:
 - Add a way for drivers to tell the core the supported alarm range is smaller
   than the date range. This is not used yet but will be useful for the
   alarmtimers in the next release.
 - fix Wvoid-pointer-to-enum-cast warnings
 - remove redundant of_match_ptr()
 - stop warning for invalid alarms when the alarm is disabled

Drivers:
 - isl12022: allow setting the trip level for battery level detection
 - pcf2127: add support for PCF2131 and multiple timestamps
 - stm32: time precision improvement, many fixes
 - twl: NVRAM support
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