rtc: pcf2127: report battery switch over

Add support for the RTC_VL_BACKUP_SWITCH flag to report battery switch over
events.

Link: https://lore.kernel.org/r/20200511140335.799133-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
1 file changed