net: replace uses of __constant_{endian}

Base versions handle constant folding now.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 29a74c0..3f6b735 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1226,7 +1226,7 @@
  */
 
 static struct packet_type arp_packet_type = {
-	.type =	__constant_htons(ETH_P_ARP),
+	.type =	cpu_to_be16(ETH_P_ARP),
 	.func =	arp_rcv,
 };