x86/sched: Use #include <linux/mutex.h> instead of #include <asm/mutex.h>

asm/mutex.h is gone from the locking tree, which makes sched/core break the build.

Use linux/mutex.h instead, which is the canonical method.

Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: peterz@infradead.org
Cc: jolsa@redhat.com
Cc: rjw@rjwysocki.net
Cc: bp@suse.de
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/itmt.c

@@ -23,7 +23,7 @@
 #include <linux/sched.h>
 #include <linux/cpumask.h>
 #include <linux/cpuset.h>
-#include <asm/mutex.h>
+#include <linux/mutex.h>
 #include <linux/sched.h>
 #include <linux/sysctl.h>
 #include <linux/nodemask.h>