[PATCHv2] ASoC: Intel: Fix build for sst-dsp.c on PPC architecture

[Liam Girdwood <liam.r.girdwood@linux.intel.com>]

Disable build on non X86 architectures except for compile testing. This fixes
the following build errors on PPC and adds an option for testing the build on other
architectures as suggested by Mark Brown :-

sound/soc/intel/sst-dsp.c: In function 'sst_dsp_outbox_write':
sound/soc/intel/sst-dsp.c:218:2: error: implicit declaration of function 'memcpy_toio' [-Werror=implicit-function-declaration]
  memcpy_toio(sst->mailbox.out_base, message, bytes);
  ^
sound/soc/intel/sst-dsp.c: In function 'sst_dsp_outbox_read':
sound/soc/intel/sst-dsp.c:231:2: error: implicit declaration of function 'memcpy_fromio' [-Werror=implicit-function-declaration]
  memcpy_fromio(message, sst->mailbox.out_base, bytes);
  ^

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
---
 sound/soc/intel/Kconfig   | 1 +
 sound/soc/intel/sst-dsp.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/sound/soc/intel/Kconfig b/sound/soc/intel/Kconfig
index c962432..4bb802b 100644
--- a/sound/soc/intel/Kconfig
+++ b/sound/soc/intel/Kconfig
@@ -15,6 +15,7 @@ config SND_SST_MFLD_PLATFORM
 config SND_SOC_INTEL_SST
 	tristate "ASoC support for Intel(R) Smart Sound Technology"
 	select SND_SOC_INTEL_SST_ACPI if ACPI
+	depends on (X86 || COMPILE_TEST)
 	help
           This adds support for Intel(R) Smart Sound Technology (SST).
           Say Y if you have such a device
diff --git a/sound/soc/intel/sst-dsp.c b/sound/soc/intel/sst-dsp.c
index e0ad2e5..6e22c12 100644
--- a/sound/soc/intel/sst-dsp.c
+++ b/sound/soc/intel/sst-dsp.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/io.h>
 
 #include "sst-dsp.h"
 #include "sst-dsp-priv.h"
-- 
1.8.3.2