feat(rme): add GPT Library

This patch introduces the Granule Protection Table (GPT)
library code. This implementation will be updated later to
be more flexible, as the current implementation is very rigid.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I3af824a28c6e9a5d36459c0c51d2d9bebfba1505
diff --git a/lib/gpt/gpt.mk b/lib/gpt/gpt.mk
new file mode 100644
index 0000000..611e504
--- /dev/null
+++ b/lib/gpt/gpt.mk
@@ -0,0 +1,8 @@
+#
+# Copyright (c) 2021, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+GPT_LIB_SRCS	:=	$(addprefix lib/gpt/,        \
+			gpt_core.c)