Add persist.sysui.notification.builder_extras_ovrd

Adds persist.sysui.notification.builder_extras_override property
associated permissions, which will be used to flag guard
a change in core/...Notification.java.

Original change I3f7e2220798d22c90f4326570732a52b0deeb54d didn't
cover zygote, which are needed for preloaded classes

Test: manual flash+adb setprop/getprop
Bug: 169435530
Change-Id: Ifad9e7c010554aa6a1e1822d5885016058c801c9
diff --git a/private/sdk_sandbox.te b/private/sdk_sandbox.te
index fc4fce3..4806e6d 100644
--- a/private/sdk_sandbox.te
+++ b/private/sdk_sandbox.te
@@ -92,6 +92,7 @@
     -pan_result_prop
     -permissive_mte_prop
     -persist_debug_prop
+    -persist_sysui_builder_extras_prop
     -pm_prop
     -powerctl_prop
     -property_service_version_prop
diff --git a/private/zygote.te b/private/zygote.te
index 9c47468..d61a431 100644
--- a/private/zygote.te
+++ b/private/zygote.te
@@ -247,6 +247,10 @@
 # preloaded classes
 get_prop(zygote, persist_wm_debug_prop)
 
+# Allow zygote to read persist_sysui_builder_extras_prop to toggle experimental features in
+# core preloaded classes
+get_prop(zygote, persist_sysui_builder_extras_prop)
+
 # Allow zygote to read /apex/apex-info-list.xml
 allow zygote apex_info_file:file r_file_perms;