RTC for 4.19 Subsystem: - new helpers to add custom sysfs attributes - struct rtc_task removal along with rtc_irq_register/rtc_irq_unregister - rtc_irq_set_state and rtc_irq_set_freq are not exported anymore Drivers: - armada38x: reset after rtc power loss - ds1307: now supports m41t11 - isl1208: now supports isl1219 and tamper detection - pcf2127: internal SRAM support