Revert of vector8 load/store on OCL

Revert of enable by default vector8 load/store on OCL

(cherry picked from commit 97b3d8f)

Author: lwesiers

IGC/Compiler/CISACodeGen/ShaderCodeGen.cpp

@@ -767,8 +767,7 @@ void AddLegalizationPasses(CodeGenContext& ctx, IGCPassManager& mpm, PSSignature
 
         bool AllowVector8LoadStore =
             IGC_IS_FLAG_ENABLED(EnableVector8LoadStore) ||
-            ((ctx.type == ShaderType::RAYTRACING_SHADER || ctx.hasSyncRTCalls()) && ctx.platform.supports8DWLSCMessage()) ||
-            ctx.platform.getPlatformInfo().eProductFamily == IGFX_PVC;
+            ((ctx.type == ShaderType::RAYTRACING_SHADER || ctx.hasSyncRTCalls()) && ctx.platform.supports8DWLSCMessage());
 
         mpm.add(createMemOptPass(AllowNegativeSymPtrsForLoad, AllowVector8LoadStore));