nixos/tee-supplicant: add tee-supplicant module

The tee-supplicant is a program that interacts with OP-TEE OS and allows
loading trusted applications at runtime (among other things). There is
an `optee` test included that uses the pkcs11 trusted application (in
upstream OP-TEE OS), loads it during system startup via tee-supplicant,
and uses `pkcs11-tool` to list available token slots.

nixos/modules/module-list.nix

@@ -930,6 +930,7 @@
   ./services/misc/taskchampion-sync-server.nix
   ./services/misc/taskserver
   ./services/misc/tautulli.nix
+  ./services/misc/tee-supplicant
   ./services/misc/tiddlywiki.nix
   ./services/misc/tp-auto-kbbl.nix
   ./services/misc/transfer-sh.nix