feat(ethos-n): add support for NPU to cert_create

Add Juno specific Makefile to the certificate tool build. That
Makefile is included by the certificate tool Makefile to add
information about the authentication data for the
Arm(R) Ethos(TM)-N NPU's firmware binary.

Signed-off-by: Mohamed Elzahhar <Mohamed.Elzahhar@arm.com>
Signed-off-by: Rob Hughes <robert.hughes@arm.com>
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>
Change-Id: Ie4b6a1c29d73b3ed5041b57f2cd88033be18a63a
diff --git a/plat/arm/board/juno/certificate/include/juno_tbb_key.h b/plat/arm/board/juno/certificate/include/juno_tbb_key.h
new file mode 100644
index 0000000..9576b9d
--- /dev/null
+++ b/plat/arm/board/juno/certificate/include/juno_tbb_key.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2023, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef JUNO_TBB_KEY_H
+#define JUNO_TBB_KEY_H
+
+#include <tbbr/tbb_key.h>
+
+/*
+ * Juno platform keys that are used to establish the COT
+ */
+enum {
+	ETHOSN_NPU_FW_CONTENT_CERT_KEY =
+		NON_TRUSTED_FW_CONTENT_CERT_KEY + 1,
+};
+#endif /* JUNO_TBB_KEY_H */