sw64: fix THREAD_INFO_IN_TASK support for suspend and hibernation

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I73KEV



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Since CONFIG_THREAD_INFO_IN_TASK has been activated, the current
task pointer can not be caculated with sp. This patch saves it in
processor_state to make suspend and hibernation work.

Signed-off-by: He Sheng <hesheng@wxiat.com>
Reviewed-by: Cui Wei <cuiwei@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>