KVM: PPC: Use __kvm_faultin_pfn() to handle page faults on Book3s HV

Replace Book3s HV's homebrewed fault-in logic with __kvm_faultin_pfn(),
which functionally does pretty much the exact same thing.

Note, when the code was written, KVM indeed didn't do fast GUP without
"!atomic && !async", but that has long since changed (KVM tries fast GUP
for all writable mappings).

Signed-off-by: Sean Christopherson <[email protected]>
Tested-by: Dmitry Osipenko <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Message-ID: <[email protected]>

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