sched/headers: Prepare for the removal of <linux/rtmutex.h> from <linux/sched.h>

Fix up missing #includes in other places that rely on sched.h doing that for them.
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>

include/linux/i2c.h

@@ -30,6 +30,7 @@
 #include <linux/device.h>	/* for struct device */
 #include <linux/sched.h>	/* for completion */
 #include <linux/mutex.h>
+#include <linux/rtmutex.h>
 #include <linux/irqdomain.h>		/* for Host Notify IRQ */
 #include <linux/of.h>		/* for struct device_node */
 #include <linux/swab.h>		/* for swab16 */

kernel/fork.c

@@ -17,6 +17,7 @@
 #include <linux/sched/coredump.h>
 #include <linux/sched/user.h>
 #include <linux/sched/numa_balancing.h>
+#include <linux/rtmutex.h>
 #include <linux/init.h>
 #include <linux/unistd.h>
 #include <linux/module.h>

kernel/locking/locktorture.c

@@ -33,6 +33,7 @@
 #include <linux/interrupt.h>
 #include <linux/sched.h>
 #include <uapi/linux/sched/types.h>
+#include <linux/rtmutex.h>
 #include <linux/atomic.h>
 #include <linux/moduleparam.h>
 #include <linux/delay.h>

kernel/rcu/tree.h

@@ -24,6 +24,7 @@
 
 #include <linux/cache.h>
 #include <linux/spinlock.h>
+#include <linux/rtmutex.h>
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 #include <linux/seqlock.h>