Move back _EnableSubsurfaceScattering (must be generic and not link to a material)

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Deferred.shader

                 Outputs outputs;
 
             #ifdef OUTPUT_SPLIT_LIGHTING
-                if (HaveSubsurfaceScattering(bsdfData))
+                if ((_EnableSubsurfaceScattering != 0) && HaveSubsurfaceScattering(bsdfData))
                 {
                     outputs.specularLighting = float4(specularLighting, 1.0);
                     outputs.diffuseLighting  = TagLightingForSSS(diffuseLighting);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/Deferred.compute

     float3 specularLighting;
     LightLoop(V, posInput, preLightData, bsdfData, bakeLightingData, featureFlags, diffuseLighting, specularLighting);
 
-    if (HaveSubsurfaceScattering(bsdfData))
+    if ((_EnableSubsurfaceScattering != 0) && HaveSubsurfaceScattering(bsdfData))
     {
         specularLightingUAV[pixelCoord] = float4(specularLighting, 1.0);
         diffuseLightingUAV[pixelCoord]  = TagLightingForSSS(diffuseLighting);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl

 
 bool HaveSubsurfaceScattering(BSDFData bsdfData)
 {
-    return (_EnableSubsurfaceScattering != 0) && HasMaterialFeatureFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING);
+    return HasMaterialFeatureFlag(bsdfData.materialFeatures, MATERIALFEATUREFLAGS_LIT_SUBSURFACE_SCATTERING);
 }
 
 //-----------------------------------------------------------------------------

ScriptableRenderPipeline/HDRenderPipeline/HDRP/ShaderPass/ShaderPassForward.hlsl

         LightLoop(V, posInput, preLightData, bsdfData, bakeLightingData, featureFlags, diffuseLighting, specularLighting);
 
 #ifdef OUTPUT_SPLIT_LIGHTING
-        if (HaveSubsurfaceScattering(bsdfData))
+        if ((_EnableSubsurfaceScattering != 0) && HaveSubsurfaceScattering(bsdfData))
         {
             outColor = float4(specularLighting, 1.0);
             outDiffuseLighting = float4(TagLightingForSSS(diffuseLighting), 1.0);