futex: add missing rtmutex.h include

This isn't included here any more since the removal of ww_mutex.h from
seqlock.h which causes a build break.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Shashank Sharma <shashank.sharma@amd.com>
Fixes: e84815cb ("seqlock: drop seqcount_ww_mutex_t")
Link: https://patchwork.freedesktop.org/patch/msgid/20220407114619.961750-1-christian.koenig@amd.com

kernel/futex/futex.h

@@ -3,6 +3,7 @@
 #define _FUTEX_H
 
 #include <linux/futex.h>
+#include <linux/rtmutex.h>
 #include <linux/sched/wake_q.h>
 
 #ifdef CONFIG_PREEMPT_RT