arm64: define _image_binary_end to fix SPL_OF_CONTROL

To make SPL_OF_CONTROL work on ARM64 SoCs, _image_binary_end must be
defined in the linker script.

 LD      spl/u-boot-spl
lib/built-in.o: In function `fdtdec_setup':
lib/fdtdec.c:1186: undefined reference to `_image_binary_end'
lib/fdtdec.c:1186: undefined reference to `_image_binary_end'
make[1]: *** [spl/u-boot-spl] Error 1
make: *** [spl/u-boot-spl] Error 2

Note:
CONFIG_SPL_SEPARATE_BSS must be defined as well on ARM64 SoCs.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/cpu/armv8/u-boot-spl.lds

@@ -54,6 +54,8 @@ SECTIONS
 		*(.__end)
 	} >.sram
 
+	_image_binary_end = .;
+
 	.bss_start : {
 		. = ALIGN(8);
 		KEEP(*(.__bss_start));