[IA64] remove CONFIG_SMP ifdef in ia64_send_ipi()

When !CONFIG_SMP, cpu_physical_id() is ia64_get_lid(), which is
functionally identical to

    (ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff

so there's no need for two versions of this code.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/irq_ia64.c

@@ -666,11 +666,7 @@ ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
 	unsigned long ipi_data;
 	unsigned long phys_cpu_id;
 
-#ifdef CONFIG_SMP
 	phys_cpu_id = cpu_physical_id(cpu);
-#else
-	phys_cpu_id = (ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff;
-#endif
 
 	/*
 	 * cpu number is in 8bit ID and 8bit EID