watchdog: add nmi_watchdog support for arm64 based on SDEI

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQCC


CVE: NA

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Add nmi_watchdog support for arm64 based on SDEI.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>

 Conflicts:
	lib/Kconfig.debug
	arch/arm64/kernel/watchdog_sdei.c
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>