davinci: da850-evm: enable driver model for NAND

Enable the driver-model on da850-evm. We need to add a dummy nand node
to the device tree, as the real nand node is a sub-node of the aemif
device.

On linux the aemif driver populates all its child nodes, but we can't do
it in u-boot currently.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Tested-by: Adam Ford <aford173@gmail.com> #da850-evm
diff --git a/include/configs/da850evm.h b/include/configs/da850evm.h
index 2dab17a..ff53613 100644
--- a/include/configs/da850evm.h
+++ b/include/configs/da850evm.h
@@ -174,6 +174,10 @@
 #define CONFIG_SPL_NAND_DRIVERS
 #define CONFIG_SPL_NAND_ECC
 #define CONFIG_SPL_NAND_LOAD
+
+#ifndef CONFIG_SPL_BUILD
+#define CONFIG_SYS_NAND_SELF_INIT
+#endif
 #endif
 
 /*