net: drop !NET_MULTI code

This is long over due.  All but two net drivers have been converted, but
those have now been dropped.

The only thing left to do is actually delete all references to NET_MULTI
and code that is compiled when that is not defined.  So here we scrub the
core code.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/board/evb64260/eth.c b/board/evb64260/eth.c
index 352505a..1492ffc 100644
--- a/board/evb64260/eth.c
+++ b/board/evb64260/eth.c
@@ -32,7 +32,7 @@
 #include "eth.h"
 #include "eth_addrtbl.h"
 
-#if defined(CONFIG_CMD_NET) && defined(CONFIG_NET_MULTI)
+#if defined(CONFIG_CMD_NET)
 
 #define GT6426x_ETH_BUF_SIZE	1536