sunxi: u-boot-spl.lds: Pass _image_binary_end

Pass _image_binary_end to make a standard way to indicate the end
of the text section in SPL.

The motivation for this is to have a uniform way to handle
the SPL boundary checks.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds b/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds
index 306a4dd..fb7a789 100644
--- a/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds
+++ b/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds
@@ -45,6 +45,7 @@
 	. = ALIGN(4);
 	__image_copy_end = .;
 	_end = .;
+	_image_binary_end = .;
 
 	.bss :
 	{