binman: Add VPL support

Add support for U-Boot's Verifying Program Loader phase.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/test/258_vpl_bss_pad.dts b/tools/binman/test/258_vpl_bss_pad.dts
new file mode 100644
index 0000000..d308dca
--- /dev/null
+++ b/tools/binman/test/258_vpl_bss_pad.dts
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		u-boot-vpl {
+		};
+
+		u-boot-vpl-bss-pad {
+		};
+
+		u-boot {
+		};
+	};
+};