* Get (mostly) rid of CFG_MONITOR_LEN definition; compute real length

instead CFG_MONITOR_LEN is now only used to determine  _at_compile_
  _time_  (!) if the environment is embedded within the U-Boot image,
  or in a separate flash sector.

* Cleanup CFG_DER #defines in config files (wd maintained only)

board/LEOX/elpt860/flash.c

@@ -118,7 +118,7 @@ flash_init (void)
   /* monitor protection ON by default */
   flash_protect (FLAG_PROTECT_SET,
 		 CFG_MONITOR_BASE,
-		 CFG_MONITOR_BASE + CFG_MONITOR_LEN-1,
+		 CFG_MONITOR_BASE + monitor_flash_len-1,
 		 &flash_info[0]);
 #endif