Revert "FIR: don't report EQUALITY_NOT_APPLICABLE for classes from java.*"

This reverts commit 73a8b4544a.

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/ConeTypeCompatibilityChecker.kt

@@ -15,7 +15,6 @@ import org.jetbrains.kotlin.fir.symbols.ConeClassLikeLookupTag
 import org.jetbrains.kotlin.fir.symbols.ConeTypeParameterLookupTag
 import org.jetbrains.kotlin.fir.symbols.impl.*
 import org.jetbrains.kotlin.fir.types.*
-import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.name.StandardClassIds
 import org.jetbrains.kotlin.types.Variance
 
@@ -209,10 +208,10 @@ internal object ConeTypeCompatibilityChecker {
         val classes = classesOrInterfaces.filter { !it.isInterface }
         // Java force single inheritance, so any pair of unrelated classes are incompatible.
         if (classes.size >= 2) {
-            return when {
-                classes.any { it.firClass.classId.packageFqName.startsWith(Name.identifier("java")) } -> Compatibility.SOFT_INCOMPATIBLE
-                classes.any { it.getHasPredefinedEqualityContract(this) } -> compatibilityUpperBound
-                else -> Compatibility.SOFT_INCOMPATIBLE
+            return if (classes.any { it.getHasPredefinedEqualityContract(this) }) {
+                compatibilityUpperBound
+            } else {
+                Compatibility.SOFT_INCOMPATIBLE
             }
         }
         val finalClass = classes.firstOrNull { it.isFinal } ?: return null