x86/mm: implement arch_faults_on_old_pte() stub on x86

arch_faults_on_old_pte is a helper to indicate that it might cause page
fault when accessing old pte. But on x86, there is feature to setting
pte access flag by hardware. Hence implement an overriding stub which
always returns false.

Signed-off-by: Jia He <[email protected]>
Suggested-by: Will Deacon <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

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