sunxi: provide ARMv8 mem_map for every ARM64 board

Every armv8 board needs the memory map, so change the #ifdef to
ARM64 to avoid enumerating every single board or SoC.
Signed-off-by: NAndre Przywara <andre.przywara@arm.com>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: NJagan Teki <jagan@openedev.com>

arch/arm/mach-sunxi/board.c

@@ -40,7 +40,7 @@ struct fel_stash {
 
 struct fel_stash fel_stash __attribute__((section(".data")));
 
-#ifdef CONFIG_MACH_SUN50I
+#ifdef CONFIG_ARM64
 #include <asm/armv8/mmu.h>
 
 static struct mm_region sunxi_mem_map[] = {