Remove KNL specific handling for new CPU target check in IR annotation

- Newly added annotations query the CPU feature using white box API which returns the list of features enabled during VM initialization.
- With JVM flag UseKNLSetting, during VM initialization AVX512 features not supported by KNL target are disabled, thus we do not need any special handling for KNL in newly introduced IR annotations (applyCPUFeature, applyCPUFeatureOr, applyCPUFeatureAnd).