Blackfin: bf561-ezkit/ibf-dsp561: invert env offset/addr logic

Have CONFIG_ENV_ADDR be based on CONFIG_ENV_OFFSET rather than the other
way around so that we can use CONFIG_ENV_OFFSET during build.  It also
avoids a little address duplication.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

include/configs/bf561-ezkit.h

@@ -80,8 +80,8 @@
 #define CONFIG_SYS_MAX_FLASH_SECT	135
 /* The BF561-EZKIT uses a top boot flash */
 #define CONFIG_ENV_IS_IN_FLASH	1
-#define CONFIG_ENV_ADDR		0x20004000
-#define CONFIG_ENV_OFFSET	(CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
+#define CONFIG_ENV_OFFSET	0x4000
+#define CONFIG_ENV_ADDR		(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 #define CONFIG_ENV_SIZE		0x2000
 #define CONFIG_ENV_SECT_SIZE	0x10000
 #if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS)

include/configs/ibf-dsp561.h

@@ -80,8 +80,8 @@
 #define CONFIG_SYS_MAX_FLASH_SECT	135	/* max number of sectors on one chip */
 /* The BF561-EZKIT uses a top boot flash */
 #define CONFIG_ENV_IS_IN_FLASH	1
-#define CONFIG_ENV_ADDR		0x20004000
-#define CONFIG_ENV_OFFSET		(CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
+#define CONFIG_ENV_OFFSET		0x4000
+#define CONFIG_ENV_ADDR		(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 #define CONFIG_ENV_SIZE		0x2000
 #define CONFIG_ENV_SECT_SIZE	0x10000	/* Total Size of Environment Sector */
 #if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS)