Add drm_hal_server to system_server signal list

Bug: 327704353
Change-Id: I2ce7833508d85dea46902ccabb536005f7bf54fb
diff --git a/private/system_server.te b/private/system_server.te
index 7306773..186c4ec 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -401,6 +401,7 @@
   hal_bluetooth_server
   hal_camera_server
   hal_codec2_server
+  hal_drm_server
   hal_face_server
   hal_fingerprint_server
   hal_gnss_server