binman: Add a ELF test file with disjoint text sections

Add a file that has two text sections at different addresses, so we can
test this behaviour in binman, once added.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/test/elf_sections.c b/tools/binman/test/elf_sections.c
new file mode 100644
index 0000000..9bcce9a
--- /dev/null
+++ b/tools/binman/test/elf_sections.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Program containing two text sections
+ */
+
+int __attribute__((section(".sram_data"))) data[29];
+
+int __attribute__((section(".sram_code"))) calculate(int x)
+{
+	data[0] = x;
+
+	return x * x;
+}
+
+int main(void)
+{
+	return calculate(123);
+}