[K/N] keep internal members in header klibs

This is also the behavior of jvm-abi-gen and desired to support
friend modules.
^KT-65442

native/native.tests/testData/klib/header-klibs/comparison/classPrivateMembers/sameAbi/A.kt

@@ -4,8 +4,8 @@ class A {
     val publicVal = 0
     fun publicMethod() = 0
 
-    internal val internalVal = 42
-    internal fun internalMethod() = 42
+    internal val internalVal = 0
+    internal fun internalMethod() = 0
 
     protected val protectedVal = 0
     protected fun protectedMethod() = 0