Support target.hostdex.required

Hostdex modules sometimes need extra required modules, add
target.hostdex.required.

Bug: 131167818
Test: manual
Change-Id: I599f3499f0b738556baeb27185371a42b4c2701b
diff --git a/java/androidmk.go b/java/androidmk.go
index 304b1c4..c2c24e2 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -47,6 +47,9 @@
 		if len(data.Target_required) > 0 {
 			fmt.Fprintln(w, "LOCAL_TARGET_REQUIRED_MODULES :=", strings.Join(data.Target_required, " "))
 		}
+		if r := library.deviceProperties.Target.Hostdex.Required; len(r) > 0 {
+			fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES +=", strings.Join(r, " "))
+		}
 		fmt.Fprintln(w, "include $(BUILD_SYSTEM)/soong_java_prebuilt.mk")
 	}
 }