Add ISAREG entry for gfx908 for ECC not supported

* Also, re-enable rocrtst

Change-Id: I70106c5a1788818387e46f240d577cbe59bc89f4

runtime/hsa-runtime/core/runtime/isa.cpp

@@ -217,6 +217,7 @@ const IsaRegistry::IsaMap IsaRegistry::GetSupportedIsas() {
   ISAREG_ENTRY_GEN(9, 0, 6, false, false)
   ISAREG_ENTRY_GEN(9, 0, 6, false, true )
   ISAREG_ENTRY_GEN(9, 0, 8, false, true )
+  ISAREG_ENTRY_GEN(9, 0, 8, false, false)
 
   return supported_isas;
 }