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>

arch/arm/cpu/arm926ejs/sunxi/u-boot-spl.lds

@@ -36,6 +36,7 @@ SECTIONS
 	. = ALIGN(4);
 	__image_copy_end = .;
 	_end = .;
+	_image_binary_end = .;
 
 	.bss :
 	{

arch/arm/cpu/armv7/sunxi/u-boot-spl.lds

@@ -45,6 +45,7 @@ SECTIONS
 	. = ALIGN(4);
 	__image_copy_end = .;
 	_end = .;
+	_image_binary_end = .;
 
 	.bss :
 	{