mm/mremap: use pmd/pud_poplulate to update page table entries

pmd/pud_populate is the right interface to be used to set the respective
page table entries.  Some architectures like ppc64 do assume that
set_pmd/pud_at can only be used to set a hugepage PTE.  Since we are not
setting up a hugepage PTE here, use the pmd/pud_populate interface.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Aneesh Kumar K.V <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Joel Fernandes <[email protected]>
Cc: Kalesh Singh <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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