build(corstone1000): rename diphda to corstone1000

diphda platform is now being renamed to corstone1000.
These changes are to replace all the instances and traces
of diphda  corstone1000.

Change-Id: I330f3a112d232b99b4721b6bf0236253b068dbba
Signed-off-by: Arpita S.K <Arpita.S.K@arm.com>
Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
diff --git a/plat/arm/board/corstone1000/common/corstone1000_security.c b/plat/arm/board/corstone1000/common/corstone1000_security.c
new file mode 100644
index 0000000..c88201b
--- /dev/null
+++ b/plat/arm/board/corstone1000/common/corstone1000_security.c
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2021-2022, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * We assume that all security programming is done by the primary core.
+ */
+void plat_arm_security_setup(void)
+{
+	/*
+	 * If the platform had additional peripheral specific security
+	 * configurations, those would be configured here.
+	 */
+}