Add phony target for depsinfo.

Test: m com.android.art-depsinfo
Change-Id: I13d741b0cbc9f5dbc9a28c9c28d17f89a2b20232
diff --git a/android/apex.go b/android/apex.go
index 6bb0751..0c7934c 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -739,6 +739,8 @@
 
 	d.flatListPath = PathForModuleOut(ctx, "depsinfo", "flatlist.txt").OutputPath
 	WriteFileRule(ctx, d.flatListPath, flatContent.String())
+
+	ctx.Phony(fmt.Sprintf("%s-depsinfo", ctx.ModuleName()), d.fullListPath, d.flatListPath)
 }
 
 // TODO(b/158059172): remove minSdkVersion allowlist