ASoC: SOF: Kconfig: Make IPC_FLOOD_TEST depend on SND_SOC_SOF

Make sure that the IPC_FLOOD client can not be built in when SND_SOC_SOF is
built as module.

Fixes: 6e9548cd ("ASoC: SOF: Convert the generic IPC flood test into SOF client")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220823121554.4255-2-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/Kconfig

@@ -196,6 +196,7 @@ config SND_SOC_SOF_DEBUG_ENABLE_FIRMWARE_TRACE
 
 config SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST
 	tristate "SOF enable IPC flood test"
+	depends on SND_SOC_SOF
 	select SND_SOC_SOF_CLIENT
 	help
 	  This option enables a separate client device for IPC flood test