kirkwood: guruplug: Relocate NAND environment area

Current default options increase u-boot size to overlap the location of the environment in NAND, move environment higher up

Signed-off-by: Gray Remlin <g_remlin@rocketmail.com>

include/configs/guruplug.h

@@ -72,8 +72,8 @@
  * it has to be rounded to sector size
  */
 #define CONFIG_ENV_SIZE			0x20000	/* 128k */
-#define CONFIG_ENV_ADDR			0x40000
-#define CONFIG_ENV_OFFSET		0x40000	/* env starts here */
+#define CONFIG_ENV_ADDR			0x60000
+#define CONFIG_ENV_OFFSET		0x60000	/* env starts here */
 
 /*
  * Default environment variables