Ensure that *bootclasspath* module types depend on device variants

Needed to allow change https://r.android.com/2089503 to be reapplied.

Bug: 232106778
Test: Apply the change and then run
      m EMMA_INSTRUMENT=true nothing
Change-Id: I92d19c51cc828295ba13951e65911db707f0f2ba

java/bootclasspath.go

@@ -84,6 +84,9 @@ func addDependencyOntoApexModulePair(ctx android.BottomUpMutatorContext, apex st
 		}
 	}
 
+	target := ctx.Module().Target()
+	variations = append(variations, target.Variations()...)
+
 	addedDep := false
 	if ctx.OtherModuleDependencyVariantExists(variations, name) {
 		ctx.AddFarVariationDependencies(variations, tag, name)