binman: arm: Include the binman symbol table

This area of the image contains symbols whose values are filled in by
binman. If this feature is not used, the table is empty.

Add this to the ARM SPL link script.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/u-boot-spl.lds b/arch/arm/cpu/u-boot-spl.lds
index 068163b..65f7b68 100644
--- a/arch/arm/cpu/u-boot-spl.lds
+++ b/arch/arm/cpu/u-boot-spl.lds
@@ -37,6 +37,13 @@
 	}
 
 	. = ALIGN(4);
+	.binman_sym_table : {
+		__binman_sym_start = .;
+		KEEP(*(SORT(.binman_sym*)));
+		__binman_sym_end = .;
+	}
+
+	. = ALIGN(4);
 
 	__image_copy_end = .;