binman: Add add test for using an Intel MRC binary

MRC (Memory Reference Code) is a binary blob used to set up the SDRAM
controller on some Intel boards. Add a test for this feature.

With this test coverage on binman is back up to 100%.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/test/50_intel_mrc.dts

@@ -0,0 +1,13 @@
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		size = <16>;
+
+		intel-mrc {
+		};
+	};
+};