sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

We are going to split <linux/sched/debug.h> out of <linux/sched.h>, which
will have to be picked up from other headers and a couple of .c files.

Create a trivial placeholder <linux/sched/debug.h> file that just
maps to <linux/sched.h> to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/parisc/kernel/pa7300lc.c

@@ -5,6 +5,7 @@
  *   Copyright (C) 2000 Philipp Rumpf */
 
 #include <linux/sched.h>
+#include <linux/sched/debug.h>
 #include <linux/smp.h>
 #include <linux/kernel.h>
 #include <asm/io.h>

arch/parisc/kernel/process.c

@@ -43,6 +43,7 @@
 #include <linux/personality.h>
 #include <linux/ptrace.h>
 #include <linux/sched.h>
+#include <linux/sched/debug.h>
 #include <linux/slab.h>
 #include <linux/stddef.h>
 #include <linux/unistd.h>

arch/parisc/kernel/signal.c

@@ -13,6 +13,7 @@
  */
 
 #include <linux/sched.h>
+#include <linux/sched/debug.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/kernel.h>

arch/parisc/kernel/traps.c

@@ -11,6 +11,7 @@
  */
 
 #include <linux/sched.h>
+#include <linux/sched/debug.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>

arch/parisc/kernel/unaligned.c

@@ -24,6 +24,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/sched/signal.h>
+#include <linux/sched/debug.h>
 #include <linux/signal.h>
 #include <linux/ratelimit.h>
 #include <linux/uaccess.h>