ASoC: Intel: Rename SST trace event header to be less generic.

The Intel audio DSP SST trace event header has been renamed from sst.h
to intel-sst.h in order to avoid any confusion with any future
Samoa Standard Time drivers ;)

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>