Remove duplicate definitions in include/lxt971a.h.

Remove duplicate definitions in include/lxt971a.h.

Remove duplicate registers and bits definitions in
include/lxt971a.h for standard MII registers, and
use values in include/miiphy.h instead.

Signed-off-by: Hugo Villeneuve <hugo.villeneuve@lyrtech.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/ns7520_eth.h b/include/ns7520_eth.h
index 123e6f4..b509697 100644
--- a/include/ns7520_eth.h
+++ b/include/ns7520_eth.h
@@ -24,6 +24,7 @@
 
 #ifdef CONFIG_DRIVER_NS7520_ETHERNET
 
+#include <miiphy.h>
 #include "lxt971a.h"
 
 /* The port addresses */