checkpatch: mark kunmap() and kunmap_atomic() deprecated

It was suggested by Fabio that kunmap() be marked deprecated in
checkpatch.[1] This did not seem necessary until an invalid conversion of
kmap_local_page() appeared in mainline.[2][3] The introduction of this bug
would have been flagged with kunmap() being marked deprecated.

Add kunmap() and kunmap_atomic() to checkpatch to help prevent further
confusion.

[1] https://lore.kernel.org/all/1884934.6tgchFWduM@suse/
[2] d406d26745ab ("cifs: skip alloc when request has no pages")
[3] https://lore.kernel.org/r/[email protected]

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ira Weiny <[email protected]>
Suggested-by: "Fabio M. De Francesco" <[email protected]>
Acked-by: Joe Perches <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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