Support platformStatic members in companion object of enums

#KT-7777 Fixed

compiler/testData/codegen/boxWithJava/platformStatic/enumCompanion/Test.java

@@ -0,0 +1,17 @@
+class Test {
+    public static String foo() {
+        return A.foo;
+    }
+
+    public static String bar() {
+        return A.bar;
+    }
+
+    public static String getBar() {
+        return A.getBar();
+    }
+
+    public static String baz() {
+        return A.baz();
+    }
+}