sunxi/nand: Add support to the SPL for loading u-boot from internal NAND memory

This commit adds support to the sunxi SPL to load u-boot from the internal
NAND. Note this only adds support to access the boot partitions to load
u-boot, full NAND support to load the kernel, etc. from the nand data
partition will come later.

Signed-off-by: Roy Spliet <r.spliet@ultimaker.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/include/configs/sun4i.h b/include/configs/sun4i.h
index ea079eb..a3c9408 100644
--- a/include/configs/sun4i.h
+++ b/include/configs/sun4i.h
@@ -18,6 +18,7 @@
 #endif
 
 #define CONFIG_SUNXI_USB_PHYS	3
+#define CONFIG_NAND_SUNXI_GPC_PORTS	{16, 17, 18, 19, 20, 21, 22, 24}
 
 /*
  * Include common sunxi configuration where most the settings are