tools headers UAPI: Sync asm-generic/mman-common.h with the kernel

To pick the changes from:

Fixes: 4ca9b385

 ("mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault page tables")

That result in these changes in the tools:

  $ tools/perf/trace/beauty/madvise_behavior.sh > before
  $ cp include/uapi/asm-generic/mman-common.h tools/include/uapi/asm-generic/mman-common.h
  $ tools/perf/trace/beauty/madvise_behavior.sh > after
  $ diff -u before after
  --- before	2021-07-05 14:30:15.167212621 -0300
  +++ after	2021-07-05 14:30:26.638462594 -0300
  @@ -18,6 +18,8 @@
   	[19] = "KEEPONFORK",
   	[20] = "COLD",
   	[21] = "PAGEOUT",
  +	[22] = "POPULATE_READ",
  +	[23] = "POPULATE_WRITE",
   	[100] = "HWPOISON",
   	[101] = "SOFT_OFFLINE",
   };
  $

I.e. now when madvise gets those behaviours as args, it will be able to
translate from the number to a human readable string.

This addresses the following perf build warning:

  Warning: Kernel ABI header at 'tools/include/uapi/asm-generic/mman-common.h' differs from latest version at 'include/uapi/asm-generic/mman-common.h'
  diff -u tools/include/uapi/asm-generic/mman-common.h include/uapi/asm-generic/mman-common.h

Cc: David Hildenbrand <david@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>