Added placeholder SELinux policy for the biometric face HAL.

Notes:
- Added face hal domain, context and file types for the default
  SELinux policy.
- Please see aosp/q/topic:"Face+Authentication"

Bug: 80155388
Test: Built successfully.
Change-Id: I2e02cf6df009c5ca476dfd842b493c6b76b7712a
diff --git a/private/system_server.te b/private/system_server.te
index ed864f5..b8e0511 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -205,6 +205,7 @@
 hal_client_domain(system_server, hal_broadcastradio)
 hal_client_domain(system_server, hal_configstore)
 hal_client_domain(system_server, hal_contexthub)
+hal_client_domain(system_server, hal_face)
 hal_client_domain(system_server, hal_fingerprint)
 hal_client_domain(system_server, hal_gnss)
 hal_client_domain(system_server, hal_graphics_allocator)