ASoC: SOF: Change section comment for SOF_IPC_TEST_

Section comment should be coherent with IPC prefix from define
names.
Signed-off-by: NKarol Trzcinski <karolx.trzcinski@linux.intel.com>
Reviewed-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NKai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20201124180017.2232128-4-kai.vehmanen@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>

include/sound/sof/header.h

@@ -118,7 +118,7 @@
 #define SOF_IPC_TRACE_DMA_POSITION		SOF_CMD_TYPE(0x002)
 #define SOF_IPC_TRACE_DMA_PARAMS_EXT		SOF_CMD_TYPE(0x003)
 
-/* debug */
+/* test */
 #define SOF_IPC_TEST_IPC_FLOOD			SOF_CMD_TYPE(0x001)
 
 /* Get message component id */