ASoC: Intel: Skylake: use a helper macro to rounding-up calculation

In 'include/linux/kernel.h', there's a helper macro to round numerical
value. Let's use it.

Signed-off-by: Takashi Sakamoto <takashi.sakamoto@miraclelinux.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Tested-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>