ixp: remove the option to include the Microcode

instead the board will have to load it from flash or ram
which will be specified by npe_ucode env var

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/README b/README
index 86c1304..522471c 100644
--- a/README
+++ b/README
@@ -3021,8 +3021,7 @@
 		  Useful on scripts which control the retry operation
 		  themselves.
 
-  npe_ucode	- see CONFIG_IXP4XX_NPE_EXT_UCOD
-		  if set load address for the NPE microcode
+  npe_ucode	- set load address for the NPE microcode
 
   tftpsrcport	- If this is set, the value is used for TFTP's
 		  UDP source port.