pkcs11-util: clean up credential handling for PKCS11 PIN

similar as the previous commit, let's clean up the credential name we
use. Use home.token-pin in case of homectl, and cryptenroll.pkcs11-pin
in case of cryptenroll.

src/cryptenroll/cryptenroll-pkcs11.c

@@ -55,7 +55,7 @@ int enroll_pkcs11(
 
         assert_se(node = crypt_get_device_name(cd));
 
-        r = pkcs11_acquire_public_key(uri, "volume enrollment operation", "drive-harddisk", &pkey, NULL);
+        r = pkcs11_acquire_public_key(uri, "volume enrollment operation", "drive-harddisk", "cryptenroll.pkcs11-pin", &pkey, NULL);
         if (r < 0)
                 return r;