ASoC: rt5640: use msleep() for long delays

ulseep_range() uses hrtimers and provides no advantage over msleep()
for larger delays. Fix up the 70/80ms delays here passing the "min"
value to msleep(). This reduces the load on the hrtimer subsystem.

Link: http://lkml.org/lkml/2017/1/11/377


Fixes: commit 246693ba ("ASoC: rt5640: change widget sequence for depop")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>