devkit8000: Add nand-spl support for new SPL

Add NAND SPL support to the devkit8000 config

Signed-off-by: Simon Schwarz <simonschwarzcor@gmail.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/board/timll/devkit8000/devkit8000.c b/board/timll/devkit8000/devkit8000.c
index 533af5a..f50d113 100644
--- a/board/timll/devkit8000/devkit8000.c
+++ b/board/timll/devkit8000/devkit8000.c
@@ -128,7 +128,7 @@
 }
 #endif
 
-#ifdef CONFIG_DRIVER_DM9000
+#if defined(CONFIG_DRIVER_DM9000) & !defined(CONFIG_SPL_BUILD)
 /*
  * Routine: board_eth_init
  * Description: Setting up the Ethernet hardware.