[Feature] Ulanzi TC001 RTC support

[BlueAndi]

• Introducing the RTC for all development boards will reduce flash space again. On the other hand no compile time dependency is needed.
• If no NTP connection is established, the RTC shall be initialized with date and time of the compile time.
• If NTP connection is established, the RTC shall be set after connection establishment immediately and periodically every 2 days.
• The RTC shall run with UTC.
• A manual adjustment of the clock would be helpuful in case there is no NTP connection at all.
• The clock driver shall be updated with the RTC date and time during startup and before the NTP connection establishment takes place.
• If no NTP connection is established, the clock driver shall be updated periodically every 4h with the RTC date and time.

[BlueAndi]

RTC implemented, but no manual adjustment of the clock.