printk: Bring back the RT bits.
This is a revert of the commits: | 07a22b61 Revert "printk: add functions to prefer direct printing" | 5831788a Revert "printk: add kthread console printers" | 2d9ef940 Revert "printk: extend console_lock for per-console locking" | 007eeab7 Revert "printk: remove @console_locked" | 05c96b37 Revert "printk: Block console kthreads when direct printing will be required" | 20fb0c82 Revert "printk: Wait for the global console lock when the system is going down" which is needed for the atomic consoles which are used on PREEMPT_RT. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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