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/property_contexts b/private/property_contexts
index 2399163..19bd51a 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -1562,4 +1562,5 @@
 ro.usb.uvc.enabled      u:object_r:usb_uvc_enabled_prop:s0 exact bool
 
 # System UI notification properties
+persist.sysui.notification.ranking_update_ashmem u:object_r:persist_sysui_ranking_update_prop:s0 exact bool
 persist.sysui.notification.builder_extras_override u:object_r:persist_sysui_builder_extras_prop:s0 exact bool