sunxi: Rename CONFIG_SUNXI to CONFIG_ARCH_SUNXI

CONFIG_SUNXI -> CONFIG_ARCH_SUNXI
and removed CONFIG_SUNIX from config_whitelist.txt

Cc: Simon Glass <sjg@chromium.org>
Cc: Ian Campbell <ijc@hellion.org.uk>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jagan Teki <jteki@openedev.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/Makefile b/Makefile
index 8d16926..75afbfc 100644
--- a/Makefile
+++ b/Makefile
@@ -1096,7 +1096,7 @@
 	$(call if_changed,objcopy)
 endif
 
-ifneq ($(CONFIG_SUNXI),)
+ifneq ($(CONFIG_ARCH_SUNXI),)
 OBJCOPYFLAGS_u-boot-sunxi-with-spl.bin = -I binary -O binary \
 				   --pad-to=$(CONFIG_SPL_PAD_TO) --gap-fill=0xff
 u-boot-sunxi-with-spl.bin: spl/sunxi-spl.bin u-boot.img FORCE