sdei: fix the wrong SDEI_CLEAR_EOI function number

euler inclusion
category: feature
Bugzilla: 12567
CVE: N/A

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The SDEI function number can not exceed 0x3f. Define a new function
number for clearing EOI.

Fixes: dd397d5febc4 ("sdei_watchdog: clear EOI of the secure timer
before kdump")

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>