Implement getParent for KotlinLightClassForDecompiledDeclaration

Fixes a bug where java resolve would be unable to resolve return types of CompiledKotlinEnum.values()/valueOf() methods
Tested by EnumAutoGeneratedMethods java against kotlin checker test

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KotlinLightClassForDecompiledDeclaration.kt

@@ -46,6 +46,8 @@ class KotlinLightClassForDecompiledDeclaration(
 
     override fun getFqName() = fqName
 
+    override fun getParent() = clsClass.parent
+
     override fun equals(other: Any?): Boolean =
             other is KotlinLightClassForDecompiledDeclaration &&
             getFqName() == other.getFqName()