tools headers: Update the linux/gfp_types.h copy with the kernel sources

tools headers: Update the linux/gfp_types.h copy with the kernel sources

To pick up the changes in:

  f3ec502b6755a3bf ("mm/slab: mark alloc tags empty for sheaves allocated with __GFP_NO_OBJ_EXT")
  241b3a09639c317b ("mm: clarify GFP_ATOMIC/GFP_NOWAIT doc-comment")

That just adds some comments, so no changes in perf tooling, just silences
this build warning:

Warning: Kernel ABI header differences:
  diff -u tools/include/linux/gfp_types.h include/linux/gfp_types.h

Please see tools/include/uapi/README.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>