KVM: PPC: Book3S HV P9: Optimise loads around context switch

It is better to get all loads for the register values in flight
before starting to switch LPID, PID, and LPCR because those
mtSPRs are expensive and serialising.

This also just tidies up the code for a potential future change
to the context switching sequence.

Signed-off-by: Nicholas Piggin <[email protected]>
Reviewed-by: Fabiano Rosas <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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