ASoC: rt5660: use msleep() for long delay

ulseep_range() uses hrtimers and provides no advantage over msleep()
for larger delays. For this large delay msleep() is preferable.

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


Fixes: commit 2b26dd4c ("ASoC: rt5660: add rt5660 codec driver")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>