KVM: PPC: Book3S HV: Stop returning internal values to userspace

Our kvm_arch_vcpu_ioctl_run currently returns the RESUME_HOST values
to userspace, against the API of the KVM_RUN ioctl which returns 0 on
success.

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220125215655.1026224-2-farosas@linux.ibm.com