kernel: update kernel 4.4 to 4.4.56

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/patches-4.4/653-disable_netlink_trim.patch

@@ -1,15 +1,12 @@
 --- a/net/netlink/af_netlink.c
 +++ b/net/netlink/af_netlink.c
-@@ -1812,27 +1812,7 @@ void netlink_detachskb(struct sock *sk,
+@@ -1187,24 +1187,7 @@ void netlink_detachskb(struct sock *sk,
  
  static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
  {
 -	int delta;
 -
  	WARN_ON(skb->sk != NULL);
--	if (netlink_skb_is_mmaped(skb))
--		return skb;
--
 -	delta = skb->end - skb->tail;
 -	if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize)
 -		return skb;