rtc: rx8025: check time validity when necessary
rtc: rx8025: check time validity when necessary

Check time validity when reading time as this is when we need to know.

Signed-off-by: Alexandre Belloni <a7228e626ecf0022ac91fc1cd8db88e71d0e5e0e@free-electrons.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs