timers: Split out timer_types.h

Cutting down on sched.h dependencies: this is going to be used in
workqueue_types.h in the next patch, so we can kill the sched.h
dependency on workqueue.h.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

include/linux/timer.h

@@ -7,21 +7,7 @@
 #include <linux/stddef.h>
 #include <linux/debugobjects.h>
 #include <linux/stringify.h>
-
-struct timer_list {
-	/*
-	 * All fields that change during normal runtime grouped to the
-	 * same cacheline
-	 */
-	struct hlist_node	entry;
-	unsigned long		expires;
-	void			(*function)(struct timer_list *);
-	u32			flags;
-
-#ifdef CONFIG_LOCKDEP
-	struct lockdep_map	lockdep_map;
-#endif
-};
+#include <linux/timer_types.h>
 
 #ifdef CONFIG_LOCKDEP
 /*

include/linux/timer_types.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_TIMER_TYPES_H
+#define _LINUX_TIMER_TYPES_H
+
+#include <linux/lockdep_types.h>
+#include <linux/types.h>
+
+struct timer_list {
+	/*
+	 * All fields that change during normal runtime grouped to the
+	 * same cacheline
+	 */
+	struct hlist_node	entry;
+	unsigned long		expires;
+	void			(*function)(struct timer_list *);
+	u32			flags;
+
+#ifdef CONFIG_LOCKDEP
+	struct lockdep_map	lockdep_map;
+#endif
+};
+
+#endif /* _LINUX_TIMER_TYPES_H */