arm64: watchdog: add switch to select sdei_watchdog/pmu_watchdog

hulk inclusion
category: feature
bugzilla: 49592
CVE: NA

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On aarch64, we can compile both SDEI_WATCHODG and PMU_WATCHDOG code
instead of choosing one.  SDEI_WATCHDOG is used by default, and if
SDEI_WATCHDOG is disabled by kernel parameter "disable_sdei_nmi_watchdog",
PMU_WATCHDOG is used instead.

Signed-off-by: Jingyi Wang <wangjingyi11@huawei.com>
Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>