Restrict sandbox access to drmservice

Bug: 226390597
Test: atest SdkSandboxRestrictionsTest

Change-Id: I49b55d66f1cdc1e8d65e3419460615822c3c3ef3
diff --git a/private/sdk_sandbox.te b/private/sdk_sandbox.te
index 782bb46..4a7a9bb 100644
--- a/private/sdk_sandbox.te
+++ b/private/sdk_sandbox.te
@@ -85,3 +85,5 @@
 neverallow sdk_sandbox { media_rw_data_file }:file no_rw_file_perms;
 
 neverallow { sdk_sandbox } tmpfs:dir no_rw_file_perms;
+
+neverallow sdk_sandbox hal_drm_service:service_manager find;