Add aconfig declarations block

Adding aconfig declarations block for java_sdk_library in Android.bp
files.
This allows detection of the APIs with enabled flags, so that it can be included in the Android SDK and the docs.

Bug: 329816770
Test: m nothing
Change-Id: If6e1059661d45ca0cb3bfdc6fb0a850aa05ec7fb
diff --git a/java/framework/Android.bp b/java/framework/Android.bp
index 32b2aee..26ea214 100644
--- a/java/framework/Android.bp
+++ b/java/framework/Android.bp
@@ -43,4 +43,7 @@
     impl_library_visibility: [
         "//packages/modules/Virtualization:__subpackages__",
     ],
+    aconfig_declarations: [
+        "avf_aconfig_flags",
+    ],
 }