sw64: fix THREAD_INFO_IN_TASK support

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6ILGG



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Since CONFIG_THREAD_INFO_IN_TASK has been activated, init_thread_info
and __current_thread_info are removed, and compile errors occur if
CONFIG_DYNAMIC_FTRACE=y or CONFIG_RELOCATABLE=y.

This patch replaces init_thread_info with task_thread_info(&init_task)
and fixes the method to relocate task pointer and stack pointer to new
kernel image for kaslr.

Signed-off-by: He Chuyue <hechuyue@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>