ASoC: SOF: topology: remove const in sizeof()

We should only use the type, the const attribute makes no sense in
sizeof().

Reported-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Acked-by: Jaroslav Kysela <perex@perex.cz>
Tested-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20200930152026.3902186-3-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>