binman: Add test for u-boot-spl-bss-pad

Add a test that we can pad the BSS with zero bytes.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/test/bss_data.c b/tools/binman/test/bss_data.c
new file mode 100644
index 0000000..f865a9d
--- /dev/null
+++ b/tools/binman/test/bss_data.c
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ *
+ * Simple program to create a _dt_ucode_base_size symbol which can be read
+ * by 'nm'. This is used by binman tests.
+ */
+
+int bss_data[10];
+int __bss_size = sizeof(bss_data);
+
+int main()
+{
+	bss_data[2] = 2;
+
+	return 0;
+}