board: rockchip: Add rk3568 evb support

Add support for rk3568 evaluation board.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/rockchip/evb_rk3568/Makefile b/board/rockchip/evb_rk3568/Makefile
new file mode 100644
index 0000000..cbda95f
--- /dev/null
+++ b/board/rockchip/evb_rk3568/Makefile
@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2021 Rockchip Electronics Co., Ltd
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+obj-y	+= evb_rk3568.o