Commit 5d375199ea ("KVM: PPC: Book3S HV: Set server for passed-through
interrupts") broke the SMP=n build:
arch/powerpc/kvm/book3s_hv_rm_xics.c:758:2: error: implicit declaration of function 'get_hard_smp_processor_id'
That is because we lost the implicit include of asm/smp.h, so include it
explicitly to get the definition for get_hard_smp_processor_id().
Fixes: 5d375199ea ("KVM: PPC: Book3S HV: Set server for passed-through interrupts")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>