ASoC: sigmadsp: align function prototype

cppcheck warning:

sound/soc/codecs/sigmadsp.c:736:60: style:inconclusive: Function
'sigmadsp_setup' argument 2 names different: declaration 'rate'
definition 'samplerate'. [funcArgNamesDifferent]
int sigmadsp_setup(struct sigmadsp *sigmadsp, unsigned int samplerate)
                                                           ^

sound/soc/codecs/sigmadsp.h:62:60: note: Function 'sigmadsp_setup'
argument 2 names different: declaration 'rate' definition
'samplerate'.
int sigmadsp_setup(struct sigmadsp *sigmadsp, unsigned int rate);
                                                           ^

sound/soc/codecs/sigmadsp.c:736:60: note: Function 'sigmadsp_setup'
argument 2 names different: declaration 'rate' definition
'samplerate'.
int sigmadsp_setup(struct sigmadsp *sigmadsp, unsigned int samplerate)
                                                           ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210312182246.5153-18-pierre-louis.bossart@linux.intel.com


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