KVM: PPC: Book3S 64: move bad_host_intr check to HV handler

The bad_host_intr check will never be true with PR KVM, move
it to HV code.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-7-npiggin@gmail.com