binman: Add support for RISC-V OpenSBI fw_dynamic blob

Add an entry for RISC-V OpenSBI's 'fw_dynamic' firmware payload.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/tools/binman/test/201_opensbi.dts b/tools/binman/test/201_opensbi.dts
new file mode 100644
index 0000000..942183f
--- /dev/null
+++ b/tools/binman/test/201_opensbi.dts
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		opensbi {
+			filename = "fw_dynamic.bin";
+		};
+	};
+};