KVM: arm64: Convert user_mem_abort() to generic page-table API

Convert user_mem_abort() to call kvm_pgtable_stage2_relax_perms() when
handling a stage-2 permission fault and kvm_pgtable_stage2_map() when
handling a stage-2 translation fault, rather than walking the page-table
manually.

Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Gavin Shan <[email protected]>
Reviewed-by: Alexandru Elisei <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Quentin Perret <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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