Minor. Move Deprecation and DeprecationLevel interfaces to core

compiler/frontend/src/org/jetbrains/kotlin/resolve/deprecationUtil.kt

@@ -50,12 +50,6 @@ import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
 private val JAVA_DEPRECATED = FqName("java.lang.Deprecated")
 
-interface Deprecation {
-    val deprecationLevel: DeprecationLevelValue
-    val message: String?
-    val target: DeclarationDescriptor
-}
-
 fun Deprecation.deprecatedByOverriddenMessage(): String? = (this as? DeprecatedByOverridden)?.additionalMessage()
 
 fun Deprecation.deprecatedByAnnotationReplaceWithExpression(): String? {
@@ -214,11 +208,6 @@ internal fun createDeprecationDiagnostic(
     }
 }
 
-// values from kotlin.DeprecationLevel
-enum class DeprecationLevelValue {
-    WARNING, ERROR, HIDDEN
-}
-
 @DefaultImplementation(CoroutineCompatibilitySupport::class)
 class CoroutineCompatibilitySupport private constructor(val enabled: Boolean) {
     constructor() : this(true)