ASoC: SOF: Kconfig: Make IPC_MESSAGE_INJECTOR depend on SND_SOC_SOF

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

Fixes: cac0b088 ("ASoC: SOF: Convert the generic IPC message injector 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/20220823121554.4255-3-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/Kconfig

@@ -215,6 +215,7 @@ config SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST_NUM
 
 config SND_SOC_SOF_DEBUG_IPC_MSG_INJECTOR
 	tristate "SOF enable IPC message injector"
+	depends on SND_SOC_SOF
 	select SND_SOC_SOF_CLIENT
 	help
 	  This option enables the IPC message injector which can be used to send