tests: boards: intel_adsp/smoke: remove IPC for CPU test

The IPC is only needed for old hardware earlier than CAVS 2.5.
They are no longer supported in the tree as their board configs
have been removed. So there is no need to do IPC anymore.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

Author: dcpleung

tests/boards/intel_adsp/smoke/src/cpus.c

@@ -159,17 +159,8 @@ static void halt_and_restart(int cpu)
 {
 	printk("halt/restart core %d...\n", cpu);
 	static bool alive_flag;
-	uint32_t all_cpus = BIT(arch_num_cpus()) - 1;
 	int ret;
 
-	/* On older hardware we need to get the host to turn the core
-	 * off. Construct an ADSPCS with only this core disabled
-	 */
-	if (!IS_ENABLED(CONFIG_SOC_INTEL_CAVS_V25)) {
-		intel_adsp_ipc_send_message(INTEL_ADSP_IPC_HOST_DEV, IPCCMD_ADSPCS,
-				     (all_cpus & ~BIT(cpu)) << 16);
-	}
-
 	ret = soc_adsp_halt_cpu(cpu);
 	zassert_ok(ret, "Couldn't halt CPU");
 
@@ -178,17 +169,6 @@ static void halt_and_restart(int cpu)
 	k_msleep(100);
 	zassert_false(alive_flag, "cpu didn't halt");
 
-	if (!IS_ENABLED(CONFIG_SOC_INTEL_CAVS_V25)) {
-		/* Likewise need to ask the host to turn it back on,
-		 * and give it some time to spin up before we hit it.
-		 * We don't have a return message wired to be notified
-		 * of completion.
-		 */
-		intel_adsp_ipc_send_message(INTEL_ADSP_IPC_HOST_DEV, IPCCMD_ADSPCS,
-				     all_cpus << 16);
-		k_msleep(50);
-	}
-
 	k_smp_cpu_start(cpu, NULL, NULL);
 
 	/* Startup can be slow */