Export app's logtags too

Bug: 336189540
Test: m out/soong/.intermediates/all-event-log-tags.txt
Test: m out/target/common/obj/all-event-log-tags.txt
Change-Id: I3c1f09e57f17e2bea1c79841efc5f8c00c1b4a1c
diff --git a/java/androidmk.go b/java/androidmk.go
index ab5e456..9cd0baf 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -453,6 +453,8 @@
 				if app.Name() != "framework-res" {
 					android.SetAconfigFileMkEntries(&app.ModuleBase, entries, app.mergedAconfigFiles)
 				}
+
+				entries.AddStrings("LOCAL_SOONG_LOGTAGS_FILES", app.logtagsSrcs.Strings()...)
 			},
 		},
 		ExtraFooters: []android.AndroidMkExtraFootersFunc{