Use the apex image when the device config asks for it.

Test: lunch walleye_jitzygote-userdebug m && all odex file use the apex image
Bug: 119800099
Change-Id: Id2fff6a4569d48b8e6a886cb82bdba205b0dd56a

java/dexpreopt.go

@@ -98,6 +98,9 @@ func (d *dexpreopter) dexpreopt(ctx android.ModuleContext, dexJarFile android.Mo
 
 	global := dexpreoptGlobalConfig(ctx)
 	bootImage := defaultBootImageConfig(ctx)
+	if global.UseApexImage {
+		bootImage = apexBootImageConfig(ctx)
+	}
 
 	var archs []android.ArchType
 	for _, a := range ctx.MultiTargets() {