net: sockets: socketpair: header fixups

* include `<zephyr/posix/fcntl.h>` instead of `<fcntl.h>`
* drop unused logging header and module declaration
* reorder headers alphabetically

Signed-off-by: Chris Friedt <[email protected]>

Author: cfriedt

subsys/net/lib/sockets/socketpair.c

@@ -4,14 +4,9 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <fcntl.h>
-
-/* Zephyr headers */
-#include <zephyr/logging/log.h>
-LOG_MODULE_REGISTER(net_spair, CONFIG_NET_SOCKETS_LOG_LEVEL);
-
 #include <zephyr/kernel.h>
 #include <zephyr/net/socket.h>
+#include <zephyr/posix/fcntl.h>
 #include <zephyr/syscall_handler.h>
 #include <zephyr/sys/__assert.h>
 #include <zephyr/sys/fdtable.h>