include/configs: remove references to SMNAND_ENV_OFFSET

In mancy cases both CONFIG_ENV_OFFSET and CONFIG_ENV_ADDR point
to an otherwise-unused SMNAND_ENV_OFFSET.
This patch will set both CONFIG_ENV_OFFSET and CONFIG_ENV_ADDR to
whatever value was defined by SMNAND_ENV_OFFSET.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/include/configs/cm_t3517.h b/include/configs/cm_t3517.h
index 282b7ae..c166bf7 100644
--- a/include/configs/cm_t3517.h
+++ b/include/configs/cm_t3517.h
@@ -209,9 +209,8 @@
 #define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_FLASH_BASE
 #define CONFIG_SYS_MONITOR_LEN		(256 << 10)	/* Reserve 2 sectors */
 
-#define SMNAND_ENV_OFFSET		0x260000 /* environment starts here */
-#define CONFIG_ENV_OFFSET		SMNAND_ENV_OFFSET
-#define CONFIG_ENV_ADDR			SMNAND_ENV_OFFSET
+#define CONFIG_ENV_OFFSET		0x260000
+#define CONFIG_ENV_ADDR			0x260000
 
 #if defined(CONFIG_CMD_NET)
 #define CONFIG_DRIVER_TI_EMAC