persist.sysui.notification.ranking_update_ashmem

Adds persist.syui.notification.ranking_update_ashmem property and
associated permissions, which will be used to flag guard a change in
core/...NotificationRankingUpdate.java.

Permissions are limited in scope to avoid unnecessary access.
Apps may need to read the flag (because NotificationRankingUpdate.java
is a core library), but setting should only be possible internally (and
via debug shell).

Test: manual flash+adb setprop/getprop
Bug: 249848655
Change-Id: I661644893714661d8c8b5553c943fa17d08c000c
diff --git a/private/app.te b/private/app.te
index 754c802..3f8560a 100644
--- a/private/app.te
+++ b/private/app.te
@@ -47,6 +47,7 @@
 get_prop(appdomain, dck_prop)
 get_prop(appdomain, persist_wm_debug_prop)
 get_prop(appdomain, persist_sysui_builder_extras_prop)
+get_prop(appdomain, persist_sysui_ranking_update_prop)
 
 # Allow the heap dump ART plugin to the count of sessions waiting for OOME
 get_prop(appdomain, traced_oome_heap_session_count_prop)