[CPU] change Eltwise layout selection logic for x86 non-CNN ModelType (…

…openvinotoolkit#26419)

### Details:
- *change Eltwise layout selection logic for x86 non-CNN ModelType,
several llm models gain performance benefits from this change since
additional reorder operators have been avoided, e.g. phi3 and bloomz*
- *details can be found in the [ticket
discussion](https://jira.devtools.intel.com/browse/CVS-148780).)*


### Tickets:
 - *148780*

src/plugins/intel_cpu/src/nodes/eltwise.cpp

@@ -2591,11 +2591,19 @@ void Eltwise::initSupportedPrimitiveDescriptors() {
         return;
 #endif
 
-    if (isChannelsFirstApplicable)
-        supportedPrimitiveDescriptors.emplace_back(initDesc(ChannelsFirst));
-    if (isBlockedApplicable)
-        supportedPrimitiveDescriptors.emplace_back(initDesc(Blocked));
-    supportedPrimitiveDescriptors.emplace_back(initDesc(Planar));
+    if (context->getConfig().modelType == Config::ModelType::CNN) {
+        if (isChannelsFirstApplicable)
+            supportedPrimitiveDescriptors.emplace_back(initDesc(ChannelsFirst));
+        if (isBlockedApplicable)
+            supportedPrimitiveDescriptors.emplace_back(initDesc(Blocked));
+        supportedPrimitiveDescriptors.emplace_back(initDesc(Planar));
+    } else {
+        supportedPrimitiveDescriptors.emplace_back(initDesc(Planar));
+        if (isChannelsFirstApplicable)
+            supportedPrimitiveDescriptors.emplace_back(initDesc(ChannelsFirst));
+        if (isBlockedApplicable)
+            supportedPrimitiveDescriptors.emplace_back(initDesc(Blocked));
+    }
 }
 
 void Eltwise::createPrimitive() {