Generate fmq java-source.

Add @hide to adil to avoid API export in framework.

Bug: 194739778
Test: make and use fmq java-source in framework
Change-Id: Ie1f7e8f9a36a1f09258581d484843f372f56e03e
Merged-In: Ie1f7e8f9a36a1f09258581d484843f372f56e03e
diff --git a/common/fmq/aidl/Android.bp b/common/fmq/aidl/Android.bp
index cebf1ce..ad5fab7 100644
--- a/common/fmq/aidl/Android.bp
+++ b/common/fmq/aidl/Android.bp
@@ -25,6 +25,7 @@
     backend: {
         java: {
             sdk_version: "module_current",
+            srcs_available: true,
         },
         cpp: {
             enabled: false,