at91sam9/at91cap: move nand drivers to drivers/mtd/nand

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/atmel/at91cap9adk/at91cap9adk.c b/board/atmel/at91cap9adk/at91cap9adk.c
index 46a4fce..e8025e7 100644
--- a/board/atmel/at91cap9adk/at91cap9adk.c
+++ b/board/atmel/at91cap9adk/at91cap9adk.c
@@ -133,7 +133,7 @@
 	/* RDY/BSY is not connected */
 
 	/* Enable NandFlash */
-	at91_set_gpio_output(AT91_PIN_PD15, 1);
+	at91_set_gpio_output(CONFIG_SYS_NAND_ENABLE_PIN, 1);
 }
 #endif