New J2K: do not allow field and method declarations to be internal

For internal members new names are generated,
So, references to them from Java will be broken

nj2k/testData/newJ2k/function/abstractMethod.kt

@@ -1 +1 @@
-internal abstract val noofGears: Int
+abstract val noofGears: Int

nj2k/testData/newJ2k/function/override.kt

@@ -1,7 +1,7 @@
 internal open class A {
-    internal open fun a() {}
+    open fun a() {}
 }
 
 internal class B : A() {
-    public override fun a() {}
+    override fun a() {}
 }

nj2k/testData/newJ2k/function/overrideAndOpen.kt

@@ -1,9 +1,9 @@
 internal open class A {
-    internal open fun foo() {}
+    open fun foo() {}
 }
 
 internal open class B : A() {
-    public override fun foo() {}
+    override fun foo() {}
 }
 
 internal class C : B() {