Clear up confusion over the CMD_POST and POST_DIAG mess.

For some reason, CONFIG_POST permeated as CONFIG_CMD_POST_DIAG
when it really means just CONFIG_CMD_DIAG.  There is no CMD_POST.
Clear this mess up some.

Signed-off-by: Jon Loeliger <jdl@freescale.com>
diff --git a/include/configs/bf537-stamp.h b/include/configs/bf537-stamp.h
index 36f55d1..bea157a 100644
--- a/include/configs/bf537-stamp.h
+++ b/include/configs/bf537-stamp.h
@@ -144,11 +144,8 @@
 #endif
 
 #ifdef CONFIG_POST
-#define CFG_CMD_POST_DIAG	CFG_CMD_DIAG
 #define FLASH_START_POST_BLOCK	11	/* Should > = 11 */
 #define FLASH_END_POST_BLOCK	71	/* Should < = 71 */
-#else
-#define CFG_CMD_POST_DIAG	0
 #endif
 
 /* CF-CARD IDE-HDD Support */
@@ -197,7 +194,10 @@
 #if (BFIN_BOOT_MODE == BF537_BYPASS_BOOT)
 
 #define CONFIG_CMD_DHCP
-#define CONFIG_CMD_POST_DIAG
+
+#if defined(CONFIG_POST)
+#define CONFIG_CMD_DIAG
+#endif
 
 #ifdef CONFIG_BF537_NAND
 #define CONFIG_CMD_NAND