sunxi: Fix CONFIG_SUNXI_GMAC references

SUNXI_GMAC was still used to configure the code where as the
same has been renamed and moved to Kconfig in below commit
"sunxi: Move SUNXI_GMAC to Kconfig"
(sha1: 4d43d065db3262f9a9918ba72457bf36dfb8e0bb)

Signed-off-by: Dave Prue <dave@prue.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
Tested-by: Mark Kettenis <kettenis@openbsd.org>
[Tweek commit message, config_whitelist.txt, build-whitelist.sh]
Signed-off-by: Jagan Teki <jagan@openedev.com>
diff --git a/arch/arm/include/asm/arch-sunxi/sys_proto.h b/arch/arm/include/asm/arch-sunxi/sys_proto.h
index a373319..096510b 100644
--- a/arch/arm/include/asm/arch-sunxi/sys_proto.h
+++ b/arch/arm/include/asm/arch-sunxi/sys_proto.h
@@ -24,7 +24,7 @@
 void return_to_fel(uint32_t lr, uint32_t sp);
 
 /* Board / SoC level designware gmac init */
-#if !defined CONFIG_SPL_BUILD && defined CONFIG_SUNXI_GMAC
+#if !defined CONFIG_SPL_BUILD && defined CONFIG_SUN7I_GMAC
 void eth_init_board(void);
 #else
 static inline void eth_init_board(void) {}