configs: Convert CONFIG_USE_NAND to CONFIG_NAND

The DA850-EVM and OMAPL138_LCDK both use checks for CONFIG_USE_NAND.
This patch changes these checks to CONFIG_NAND which is already defined
in Kconfig.  Since the OMAPL138_LCDK already had CONFIG_NAND defined in its
defconfig, it can be deleted from configs/omapl138_lcdk.h.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/include/configs/omapl138_lcdk.h b/include/configs/omapl138_lcdk.h
index f34e35e..85d6b03 100644
--- a/include/configs/omapl138_lcdk.h
+++ b/include/configs/omapl138_lcdk.h
@@ -16,7 +16,6 @@
 #define CONFIG_DRIVER_TI_EMAC
 #undef CONFIG_USE_SPIFLASH
 #undef	CONFIG_SYS_USE_NOR
-#define	CONFIG_USE_NAND
 
 /*
 * Disable DM_* for SPL build and can be re-enabled after adding
@@ -142,7 +141,7 @@
 /*
  * Flash & Environment
  */
-#ifdef CONFIG_USE_NAND
+#ifdef CONFIG_NAND
 #define CONFIG_ENV_OFFSET		0x0 /* Block 0--not used by bootcode */
 #define CONFIG_ENV_SIZE			(128 << 9)
 #define	CONFIG_SYS_NAND_USE_FLASH_BBT
@@ -258,12 +257,12 @@
 #define CONFIG_CLOCKS
 #endif
 
-#ifdef CONFIG_USE_NAND
+#ifdef CONFIG_NAND
 #define CONFIG_MTD_DEVICE
 #define CONFIG_MTD_PARTITIONS
 #endif
 
-#if !defined(CONFIG_USE_NAND) && \
+#if !defined(CONFIG_NAND) && \
 	!defined(CONFIG_SYS_USE_NOR) && \
 	!defined(CONFIG_USE_SPIFLASH)
 #define CONFIG_ENV_SIZE		(16 << 10)