The system RTC component provides access to a synthetic real time clock. While
it can get its initial value from a hardware RTC, it will interpolate the time
by using a Timer session at runtime.
Like the RTC driver component, if the 'allow_setting_rtc' attribute in the
'config' node is set to 'yes', it will use the content of the 'set_rtc' ROM to
update the RTC value. A valid ROM must contain a top node with the following
attributes:
* 'year' (e.g. 2019)
* 'month' (1 - 12)
* 'day' (1 - 31)
* 'hour' (0 - 23)
* 'minute' (0 - 59)
* 'second' (0 - 59)
The component will always report the time as 24h day in UTC.
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