create new system label for biometric virtual hal sysprop

and avoid moving old label (virtual_face_hal_prop) from vendor to system.
Bug: 379031135
Test: manual

Change-Id: Idf26643ad0d98bfe32165598a244ce01199e586b
diff --git a/private/property.te b/private/property.te
index 5beb712..135bcad 100644
--- a/private/property.te
+++ b/private/property.te
@@ -90,6 +90,7 @@
 until_board_api(202504, `
     system_public_prop(bluetooth_finder_prop)
     system_public_prop(virtual_fingerprint_prop)
+    system_public_prop(virtual_face_prop)
 ')
 
 # These types will be public starting at board api 202504