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/20210616045239.370802-6-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Hugh Dickins <hughd@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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