SUNRPC: Remove "#include <trace/events/skb.h>"

Clean up: Commit 850cbaddb5 ("udp: use it's own memory accounting
schema") removed the last skb-related tracepoint from svcsock.c, so
it is no longer necessary to include trace/events/skb.h.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/svcsock.c

@@ -45,7 +45,6 @@
 #include <net/tcp_states.h>
 #include <linux/uaccess.h>
 #include <asm/ioctls.h>
-#include <trace/events/skb.h>
 
 #include <linux/sunrpc/types.h>
 #include <linux/sunrpc/clnt.h>