binman: Make a start on an iMX8 test

This patch is for Marek, to provide a starting point.

To try it, use 'binman test -T' and see the missing coverage.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/test/339_nxp_imx8.dts b/tools/binman/test/339_nxp_imx8.dts
new file mode 100644
index 0000000..cb512ae
--- /dev/null
+++ b/tools/binman/test/339_nxp_imx8.dts
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		nxp-imx8mimage {
+			args;	/* TODO: Needed by mkimage etype superclass */
+			nxp,boot-from = "sd";
+			nxp,rom-version = <1>;
+			nxp,loader-address = <0x10>;
+		};
+	};
+};