ASoC: Intel: common: use c99 syntax for ACPI/machine tables

Before we add new fields for SOF support, move to C99 syntax
as done for atom/sst and legacy hsw/bdw code
No functional change

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>