refactor(sgi): change "sgi" to "nrd" within file names

As part of the move from "sgi" to "neoverse_rd", rename every occurance
of "sgi" within file names to "nrd".

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I587072f1dd42bbda2730e24139c88945908aa730
diff --git a/group/scp-boot-tests-coverage/fvp-sgi575,fvp-sgi575-tbb:fvp-linux.nrd-fip.nrd-sgi575-debug-bmcov b/group/scp-boot-tests-coverage/fvp-sgi575,fvp-sgi575-tbb:fvp-linux.nrd-fip.nrd-sgi575-debug-bmcov
new file mode 100644
index 0000000..892d94a
--- /dev/null
+++ b/group/scp-boot-tests-coverage/fvp-sgi575,fvp-sgi575-tbb:fvp-linux.nrd-fip.nrd-sgi575-debug-bmcov
@@ -0,0 +1,6 @@
+#
+# Copyright (c) 2020-2024, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+