tools: Sync if_xdp.h uapi tooling header

Sync if_xdp.h uapi header to remove following warning:

  Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h'
  differs from latest version at 'include/uapi/linux/if_xdp.h'

Fixes: 48eb03dd ("xsk: Add TX timestamp and TX checksum offload support")
Signed-off-by: Vishal Chourasia <vishalc@linux.ibm.com>
Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20250115032248.125742-1-yoong.siang.song@intel.com