Add label for time (zone) system properties

This adds a label for system properties that will affect system-wide
time / time detection logic.

The first example will be something like:
persist.time.detection_impl_version

Bug: 78217059
Test: build
Change-Id: I46044f1e28170760001da9acf2496a1e3037e48a
diff --git a/private/compat/26.0/26.0.ignore.cil b/private/compat/26.0/26.0.ignore.cil
index ebd4037..79cadf8 100644
--- a/private/compat/26.0/26.0.ignore.cil
+++ b/private/compat/26.0/26.0.ignore.cil
@@ -118,6 +118,7 @@
     thermalserviced
     thermalserviced_exec
     thermalserviced_tmpfs
+    time_prop
     timedetector_service
     timezone_service
     timezonedetector_service