[FIR] provide correct origin and source to default backing field

Now it is aligned with default accessors
Covered by
analysis/analysis-api/testData/symbols/symbolByReference/accessorField.kt
test

^KT-57648
^KT-55723

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/FirMemberDeserializer.kt

@@ -415,12 +415,15 @@ class FirMemberDeserializer(private val c: FirDeserializationContext) {
                 )
             backingField = FirDefaultPropertyBackingField(
                 c.moduleData,
+                FirDeclarationOrigin.Library,
+                source = null,
                 backingFieldAnnotations,
                 returnTypeRef,
                 isVar,
                 symbol,
-                status
+                status,
             )
+
             if (hasGetter) {
                 this.getter = loadPropertyGetter(
                     proto,