chore(rdfremont): rename RD-Fremont to RD-V3

RD-Fremont is renamed to RD-V3. This change aligns with existing
products like RD-V1 and RD-V2. The update replaces all instances
of "Fremont" with "V3" in file names and contents.

Change-Id: I69595927df05876179eae0244a0c9f76e1370e5a
Signed-off-by: Jerry Wang <Jerry.Wang4@arm.com>
diff --git a/secure_rd_v3/BUILD.gn b/secure_rd_v3/BUILD.gn
new file mode 100644
index 0000000..3cc9686
--- /dev/null
+++ b/secure_rd_v3/BUILD.gn
@@ -0,0 +1,8 @@
+# Copyright 2023 The Hafnium Authors.
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/BSD-3-Clause.
+
+source_set("secure_rd_v3") {
+}