zephyr: cpu: only run z_init_cpu() on boot for MTL

Only run z_init_cpu() on boot for MTL by replacing the check for
IMR_CONTEXT_SAVE with a check for ACE. Therefore,

- on MTL, only run z_init_cpu() on boot, not when waking up from D3,
  regardless whether saving to IMR is enabled or not.

- on other platforms, run z_init_cpu() both on boot and on waking up
  from D3.

The difference is caused by differnet Zephyr implementations between
MTL and other platforms.

Moreover, saving context to IMR is a feature for MTL only, not available
for other platorms.

Signed-off-by: Mengdong Lin <[email protected]>

zephyr/lib/cpu.c

@@ -148,7 +148,7 @@ int cpu_enable_core(int id)
 	 * initialization. By reinitializing the idle thread, we would overwrite the kernel structs
 	 * and the idle thread stack.
 	 */
-	if (!IS_ENABLED(CONFIG_ADSP_IMR_CONTEXT_SAVE) ||
+	if (!defined(CONFIG_ACE) ||
 	    pm_state_next_get(id)->state == PM_STATE_ACTIVE)
 		z_init_cpu(id);
 #endif