sdei_watchdog: Add CPU_PM_ENTER_FAILED handling in sdei_watchdog_pm_notifier

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQCC
CVE: NA

-------------------------------------------------

The `CPU_PM_ENTER_FAILED` case was added to align with the handling in
`sdei_pm_notifier`. This ensures proper masking/unmasking of events for
the CPU when entering idle fails, maintaining consistency across CPU power
 management actions.

Fixes: c8f96adca7fa ("arm64/watchdog: fix watchdog failure in low power scenarios")
Signed-off-by: Bowen You <youbowen2@huawei.com>
(cherry picked from commit f2f9b6cb6466eb51c2d654981c767bc5d719b001)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: Bowen You

arch/arm64/kernel/watchdog_sdei.c

@@ -123,6 +123,7 @@ static int sdei_watchdog_pm_notifier(struct notifier_block *nb,
 			rv = sdei_api_event_disable(sdei_watchdog_event_num);
 		break;
 	case CPU_PM_EXIT:
+	case CPU_PM_ENTER_FAILED:
 		if (per_cpu(sdei_usr_en, smp_processor_id()))
 			rv = sdei_api_event_enable(sdei_watchdog_event_num);
 		break;