sepolicy for server configurable flags

Test: manual on device
Change-Id: Ibafe1b345489c88a49a7ed3e2e61e5cc5e1880a1
diff --git a/private/property_contexts b/private/property_contexts
index 58cc983..dff3cf8 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -161,3 +161,6 @@
 
 # Properties that relate to time / time zone detection behavior.
 persist.time.           u:object_r:time_prop:s0
+
+# Properties that relate to server configurable flags
+persist.device_config.attempted_boot_count        u:object_r:device_config_boot_count_prop:s0