rtc: add new VL flag for backup switchover

A new flag RTC_VL_BACKUP_SWITCH means that a backup switchover happened
since last flag clear.

Link: https://lore.kernel.org/r/20200505201310.255145-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
1 file changed