[qsd8250] Fix delays between bumping up Scorpion clock frequency

The delays between bumping up Scorpion clock frequency are of the
order of usec, but were incorrectly using thread_sleep which adds
delays in order of msec.  Updating the delays by rounding them up
to 1 ms and continue to use thread_sleep.

Change-Id: Ida89ef2de80075a1d8042493bac606080a99417b
1 file changed