Set LOCAL_PREBUILT_MODULE_FILE for hostdex modules

Java modules with hostdex: true have to manually create an extra
androidmk entry, which was missing LOCAL_PREBUILT_MODULE_FILE.

Test: m checkbuild
Change-Id: I0fb50196fe01ba9eb0c4aef446e7c8f28bbaec12
diff --git a/java/androidmk.go b/java/androidmk.go
index 4d3af12..930354e 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -75,6 +75,11 @@
 				fmt.Fprintln(w, "LOCAL_MODULE := "+name+"-hostdex")
 				fmt.Fprintln(w, "LOCAL_IS_HOST_MODULE := true")
 				fmt.Fprintln(w, "LOCAL_MODULE_CLASS := JAVA_LIBRARIES")
+				if library.dexJarFile != nil {
+					fmt.Fprintln(w, "LOCAL_PREBUILT_MODULE_FILE :=", library.dexJarFile.String())
+				} else {
+					fmt.Fprintln(w, "LOCAL_PREBUILT_MODULE_FILE :=", library.implementationAndResourcesJar.String())
+				}
 				if library.installFile == nil {
 					fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
 				}