seccomp: Use current_pt_regs() instead of task_pt_regs(current)

As described in commit a3460a59747c ("new helper: current_pt_regs()"):
- arch versions are "optimized versions".
- some architectures have task_pt_regs() working only for traced tasks
  blocked on signal delivery. current_pt_regs() needs to work for *all*
  processes.

In preparation for adding a coccinelle rule for using current_*(), instead
of raw accesses to current members, modify seccomp_do_user_notification(),
__seccomp_filter(), __secure_computing() to use current_pt_regs().

Signed-off-by: Denis Efremov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kees: Reworded commit log, add comment to populate_seccomp_data()]
Signed-off-by: Kees Cook <[email protected]>

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