ASoC: SOF: Change section comment for SOF_IPC_TEST_

Section comment should be coherent with IPC prefix from define
names.

Signed-off-by: Karol Trzcinski <karolx.trzcinski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20201124180017.2232128-4-kai.vehmanen@linux.intel.com


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