netconsole: Use printk context for CPU and task information

netconsole: Use printk context for CPU and task information

Use the CPU and task name captured at printk() time from
nbcon_write_context instead of querying the current execution context.
This provides accurate information about where the message originated,
rather than where netconsole happens to be running.

For CPU, use wctxt->cpu instead of raw_smp_processor_id().

For taskname, use wctxt->comm directly which contains the task
name captured at printk time.

This change ensures netconsole outputs reflect the actual context that
generated the log message, which is especially important when the
console driver runs asynchronously in a dedicated thread.

Reviewed-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260206-nbcon-v7-4-62bda69b1b41@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>