soc/intel_adsp: We can't halt "another" processor on uni-processor

When there's only 1 CPU, there's no other CPU to halt. Elide the
soc_adsp_halt_cpu function to make sure it won't be called.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

soc/intel/intel_adsp/cavs/multiprocessing.c

@@ -199,6 +199,8 @@ __imr void soc_mp_init(void)
 	soc_cpus_active[0] = true;
 }
 
+#if CONFIG_MP_MAX_NUM_CPUS > 1
+
 int soc_adsp_halt_cpu(int id)
 {
 	unsigned int irq_mask;
@@ -238,3 +240,5 @@ int soc_adsp_halt_cpu(int id)
 	}
 	return 0;
 }
+
+#endif