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

To pick the changes from:

Fixes: 4ca9b3859dac14bb ("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 <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/include/uapi/asm-generic/mman-common.h

···
 #define MADV_COLD	20		/* deactivate these pages */
 #define MADV_PAGEOUT	21		/* reclaim these pages */
 
+#define MADV_POPULATE_READ	22	/* populate (prefault) page tables readable */
+#define MADV_POPULATE_WRITE	23	/* populate (prefault) page tables writable */
+
 /* compatibility flags */
 #define MAP_FILE	0