net: Refactor to use NetSendPacket instead of eth_send directly

Use this entry-point consistently across the net/ code
Use a static inline function to preserve code size

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>

net/cdp.c

@@ -216,7 +216,7 @@ CDPSendTrigger(void)
 		chksum = 0xFFFF;
 	*cp = htons(chksum);
 
-	(void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
+	NetSendPacket(NetTxPacket, (uchar *)s - NetTxPacket);
 	return 0;
 }