printk: Remove printk.h inclusion in percpu.h

After the commit 42a0bb3 ("printk/nmi: generic solution for safe
printk in NMI") the printk.h is not needed anymore in percpu.h.

Moreover `make headerdep` complains (an excerpt)

In file included from linux/printk.h,
                 from linux/dynamic_debug.h:188
                 from linux/printk.h:559 <-- here
                 from linux/percpu.h:9
                 from linux/idr.h:17
include/net/9p/client.h:13: warning: recursive header inclusion

Yeah, it's not a root cause of this, but removing will help to reduce
the noise.

Fixes: 42a0bb3 ("printk/nmi: generic solution for safe printk in NMI")
Signed-off-by: Andy Shevchenko <[email protected]>
Acked-by: Dennis Zhou <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: andy-shev

include/linux/percpu.h

@@ -6,7 +6,6 @@
 #include <linux/preempt.h>
 #include <linux/smp.h>
 #include <linux/cpumask.h>
-#include <linux/printk.h>
 #include <linux/pfn.h>
 #include <linux/init.h>