entry: Provide [syscall_]enter_from_user_mode_randomize_stack()

Randomizing the syscall stack can only happen after state is established
via enter_from_user_mode() or syscall_enter_from_user_mode(). The earlier
it happens the better.

Provide two new macros to consolidate that:

  - enter_from_user_mode_randomize_stack()
	enter_from_user_mode();
	add_random_kstack_offset_irqsoff();

  - syscall_enter_from_user_mode_randomize_stack()
	enter_from_user_mode_randomize_stack();
	syscall_enter_from_user_mode_work();

to reduce boiler plate code.

Those are macros and not inline functions as the latter would limit the
stack randomization scope to the inline function itself.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Reviewed-by: Radu Rendec <radu@rendec.net>
Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Link: https://patch.msgid.link/20260707190253.816918647@kernel.org

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