Fix non-x86 builds

I've just reverted some code what it was in 5.5 by wrapping new x86
specific bits with #if's, e.g.:
- CPUID is x86 specific
- mwait is x86 specific

Change-Id: I6cefae34282c777c7340daf3f934d2a11742502e
Signed-off-by: Jeremy Newton <Jeremy.Newton@amd.com>


[ROCm/ROCR-Runtime commit: 132a19e9c3]

projects/rocr-runtime/runtime/hsa-runtime/core/util/lnx/os_linux.cpp

@@ -60,7 +60,9 @@
 #include <string>
 #include <utility>
 #include "core/inc/runtime.h"
+#if defined(__i386__) || defined(__x86_64__)
 #include <cpuid.h>
+#endif
 
 namespace rocr {
 namespace os {
@@ -693,8 +695,8 @@ uint64_t SystemClockFrequency() {
 }
 
 bool ParseCpuID(cpuid_t* cpuinfo) {
+#if defined(__i386__) || defined(__x86_64__)
   uint32_t eax, ebx, ecx, edx, max_eax = 0;
-
   memset(cpuinfo, 0, sizeof(*cpuinfo));
 
   /* Make sure current CPU supports at least EAX 4 */
@@ -713,6 +715,9 @@ bool ParseCpuID(cpuid_t* cpuinfo) {
     }
   }
   return true;
+#else
+  return false;
+#endif
 }
 
 }   //  namespace os