ASoC: Intel: Add depends on X86

Make all Intel audio drivers dependent on X86 to avoid compilation
errors for s390 and xtensa architectures.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/Kconfig

@@ -31,6 +31,7 @@ config SND_SOC_ACPI_INTEL_MATCH
 
 config SND_SOC_INTEL_SST_TOPLEVEL
 	tristate "Intel ASoC SST drivers"
+	depends on X86
 	select SND_SOC_INTEL_MACH
 	select SND_SOC_INTEL_COMMON