ASoC: Intel: soc-acpi: change machine driver name for WM8804 platforms

Remove obsolete reference to Broxton since the machine driver will be
reused on other platforms, e.g. Up Extreme.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200515210731.10942-2-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>