Ian Lepore f1b21e2c92 Add common code to support realtime clocks that store year without century.
Most realtime clocks store the year as 2 BCD digits.  Some add a century bit
to extend the range another hundred years.  Every clock driver has its own
code to determine the century and pass a full year value to clock_ct_to_ts().
Now clock drivers can just convert BCD to bin and store the result in the
clocktime struct and let the common code figure out the century.  Clocks
with a century bit can just add 100 to year if the century bit is on.
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