rtc: add rtc command
Mostly as an aid for debugging RTC drivers, provide a command that can be used to read/write arbitrary registers (assuming the driver provides the read/write methods or their single-register-at-a-time variants). Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NHeiko Schocher <hs@denx.de> Signed-off-by: NRasmus Villemoes <rasmus.villemoes@prevas.dk>
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cmd/rtc.c
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