KVM: ARM: Remove pgtable page standard functions from stage-2 page tables

ARM64 standard pgtable functions are going to use pgtable_page_[ctor|dtor]
or pgtable_pmd_page_[ctor|dtor] constructs. At present KVM guest stage-2
PUD|PMD|PTE level page tabe pages are allocated with __get_free_page()
via mmu_memory_cache_alloc() but released with standard pud|pmd_free() or
pte_free_kernel(). These will fail once they start calling into pgtable_
[pmd]_page_dtor() for pages which never originally went through respective
constructor functions. Hence convert all stage-2 page table page release
functions to call buddy directly while freeing pages.

Reviewed-by: Suzuki K Poulose <[email protected]>
Acked-by: Yu Zhao <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Signed-off-by: Anshuman Khandual <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

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