printk: revert ktime_get() timestamps

revert 19ef9309273d26cb005cb23e6a370353dca91099.

Kevin Winchester reported a lockup during X startup an bisected
it to this commit.

Reported-by: Kevin Winchester <kjwinchester@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 file changed