Tinkerboard RTC功能实现（armbian）
https://forum.armbian.com/topic/5346-rtc-ds1307-i2c-for-tinkerboard/RTC ds1307 i2C for Tinkerboard
https://github.com/armbian/build/blob/bd86656819af402a8d301d823dd76e8877ca809b/config/kernel/linux-rockchip-next.config#L3790
The driver is built in.
device specified/lib/udev/hwclock-set /dev/rtc1
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