KVM: PPC: BookS PR-KVM and BookE do not support context tracking

The context tracking code in PR-KVM and BookE implementations is not
complete, and can cause host crashes if context tracking is enabled.

Make these implementations depend on !CONTEXT_TRACKING_USER.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221014030729.2077151-2-npiggin@gmail.com