Add a new RTC driver for Armada38x
New driver registers RTC as system clock. New RTC resolution is 1 sec. Settime and gettime functions were implemented.
Reviewed by: andrew, ian Obtained from: Semihalf Sponsored by: Stormshield Submitted by: Jan Dabros <jsd@semihalf.com> Differential revision: https://reviews.freebsd.org/D4421
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