Add sepolicy SF native boot namespace.

Following go/android-native-flag-api-manual.

Bug: 190769260
Test: make.
Change-Id: I84fe7e9d046fbbe737f09043589b19e71981f521
diff --git a/private/property_contexts b/private/property_contexts
index 62862e9..326232d 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -241,6 +241,7 @@
 persist.device_config.statsd_native.                u:object_r:device_config_statsd_native_prop:s0
 persist.device_config.statsd_native_boot.           u:object_r:device_config_statsd_native_boot_prop:s0
 persist.device_config.storage_native_boot.          u:object_r:device_config_storage_native_boot_prop:s0
+persist.device_config.surface_flinger_native_boot.  u:object_r:device_config_surface_flinger_native_boot_prop:s0
 persist.device_config.swcodec_native.               u:object_r:device_config_swcodec_native_prop:s0
 persist.device_config.window_manager_native_boot.   u:object_r:device_config_window_manager_native_boot_prop:s0