net_dma: simple removal

Per commit "77873803363c net_dma: mark broken" net_dma is no longer used
and there is no plan to fix it.

This is the mechanical removal of bits in CONFIG_NET_DMA ifdef guards.
Reverting the remainder of the net_dma induced changes is deferred to
subsequent patches.

Marked for stable due to Roman's report of a memory leak in
dma_pin_iovec_pages():

    https://lkml.org/lkml/2014/9/3/177

Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: David Whipple <whipple@securedatainnovations.ch>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: <stable@vger.kernel.org>
Reported-by: Roman Gushchin <klamm@yandex-team.ru>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

net/dccp/proto.c

@@ -848,7 +848,7 @@ int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 		default:
 			dccp_pr_debug("packet_type=%s\n",
 				      dccp_packet_name(dh->dccph_type));
-			sk_eat_skb(sk, skb, false);
+			sk_eat_skb(sk, skb);
 		}
 verify_sock_status:
 		if (sock_flag(sk, SOCK_DONE)) {
@@ -905,7 +905,7 @@ verify_sock_status:
 			len = skb->len;
 	found_fin_ok:
 		if (!(flags & MSG_PEEK))
-			sk_eat_skb(sk, skb, false);
+			sk_eat_skb(sk, skb);
 		break;
 	} while (1);
 out: