mm: pass VMA instead of MM to follow_pte()

... and centralize the VM_IO/VM_PFNMAP sanity check in there. We'll
now also perform these sanity checks for direct follow_pte()
invocations.

For generic_access_phys(), we might now check multiple times: nothing to
worry about, really.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Acked-by: Sean Christopherson <[email protected]>	[KVM]
Cc: Alex Williamson <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Fei Li <[email protected]>
Cc: Gerald Schaefer <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Yonghua Huang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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