Use 28.txt as API file for migrating NULLs in Metalava

Use last released API file for annotations reference in master branch
(non-releasing branch).

Test: manual
Bug: b/78245848
Change-Id: I0520231619001032c00d98fdc8cd86aa41f4fa14

parent d5dc5a71

Android.bp

+1 −1

Original line number	Diff line number	Diff line
		@@ -1571,7 +1571,7 @@ doc_defaults {
		installable: false,
		metalava_enabled: true,
		metalava_annotations_enabled: true,
		metalava_previous_api: ":public-api-for-metalava-annotations",
		metalava_previous_api: ":last-released-public-api",
		metalava_merge_annotations_dirs: [
		"metalava-manual",
		"ojluni-annotated-stubs",