mm: new primitive kvmemdup()

Similar to kmemdup(), but support large amount of bytes with kvmalloc()
and does *not* guarantee that the result will be physically contiguous. 
Use only in cases where kvmalloc() is needed and free it with kvfree(). 
Also adapt policy_unpack.c in case someone bisect into this.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Hao Sun <[email protected]>
Suggested-by: Daniel Borkmann <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: John Johansen <[email protected]>
Cc: Paul Moore <[email protected]>
Cc: James Morris <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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