powerpc: Fix pud_mkwrite() definition after pte_mkwrite() API changes

Fix up missed semantic mis-merge between commits

  161e393c ("mm: Make pte_mkwrite() take a VMA")
  27af67f3 ("powerpc/book3s64/mm: enable transparent pud hugepage")

where the newly introduced powerpc use of 'pte_mkwrite()' needs to use
the 'novma()' versions as per commit 2f0584f3 ("mm: Rename arch
pte_mkwrite()'s to pte_mkwrite_novma()").

Fixes: df57721f

 ("Merge tag 'x86_shstk_for_6.6-rc1' of [...]")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>