build(rk3568): add build configs for rk3568

This is needed to support compiling new source file.
Also updated the default tf-a build configs for rk3568.

Signed-off-by: shengfei Xu <xsf@rock-chips.com>
Change-Id: I3ee2c1f64e65d76bdfcf262d28122c11cdf7c9c8
diff --git a/group/tf-l1-build-plat/rk3568-coreboot:nil b/group/tf-l1-build-plat/rk3568-coreboot:nil
new file mode 100644
index 0000000..5515958
--- /dev/null
+++ b/group/tf-l1-build-plat/rk3568-coreboot:nil
@@ -0,0 +1,6 @@
+#
+# Copyright (c) 2023 Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
diff --git a/group/tf-l1-build-plat/rk3568-default:nil b/group/tf-l1-build-plat/rk3568-default:nil
new file mode 100644
index 0000000..6330aaf
--- /dev/null
+++ b/group/tf-l1-build-plat/rk3568-default:nil
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2023 Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+post_tf_archive() {
+	echo "Removing bl31.bin"
+	rm -f "$archive/bl31.bin"
+	touch "$archive/bl31.bin.deleted"
+}