ASoC: Intel: document what Kconfig options do

Document in comments what the options are supposed to mean, before
clean-up in next patch.

No functionality change here.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/Kconfig

@@ -16,16 +16,27 @@ if SND_SOC_INTEL_SST_TOPLEVEL
 
 config SND_SST_IPC
 	tristate
+	# This option controls the IPC core for HiFi2 platforms
 
 config SND_SST_IPC_PCI
 	tristate
 	select SND_SST_IPC
+	# This option controls the PCI-based IPC for HiFi2 platforms
+	#  (Medfield, Merrifield).
 
 config SND_SST_IPC_ACPI
 	tristate
 	select SND_SST_IPC
 	select SND_SOC_INTEL_SST
 	select IOSF_MBI
+	# This option controls the ACPI-based IPC for HiFi2 platforms
+	# (Baytrail, Cherrytrail)
+
+config SND_SOC_INTEL_SST_ACPI
+	tristate
+	# This option controls ACPI-based probing on
+	# Haswell/Broadwell/Baytrail legacy and will be set
+	# when these platforms are enabled
 
 config SND_SOC_INTEL_SST
 	tristate
@@ -34,9 +45,9 @@ config SND_SOC_INTEL_SST
 config SND_SOC_INTEL_SST_FIRMWARE
 	tristate
 	select DW_DMAC_CORE
-
-config SND_SOC_INTEL_SST_ACPI
-	tristate
+	# This option controls firmware download on
+	# Haswell/Broadwell/Baytrail legacy and will be set
+	# when these platforms are enabled
 
 config SND_SOC_INTEL_HASWELL
 	tristate "Intel ASoC SST driver for Haswell/Broadwell"