pm: Move pm_initialize call from driver_initialize to xxx_pminitialize

since it's too late with the below commit:
ommit a594a5d7a8
Author: chao.an <anchao@xiaomi.com>
Date:   Mon Apr 11 19:44:26 2022 +0800

    sched/init: drivers_initialize() should be late than up_initialize()

    up_initialize
    |
     ->up_serialinit
       |
        ->uart_register  /* ("/dev/console", &CONSOLE_DEV); */

    drivers_initialize
    |
     ->syslog_console_init
       |
        ->register_driver /* ("/dev/console", &g_consoleops, 0666, NULL); */

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

arch/ceva/src/common/up_idle.c

@@ -163,5 +163,8 @@ void weak_function up_cpu_normal(void)
 #ifdef CONFIG_PM
 void up_pminitialize(void)
 {
+  /* Initialize the NuttX power management subsystem proper */
+
+  pm_initialize();
 }
 #endif