KVM: PPC: Book3S HV P9: Switch to guest MMU context as late as possible

Move MMU context switch as late as reasonably possible to minimise code
running with guest context switched in. This becomes more important when
this code may run in real-mode, with later changes.

Move WARN_ON as early as possible so program check interrupts are less
likely to tangle everything up.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-21-npiggin@gmail.com

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