posix-timers: Move the do_schedule_next_timer declaration

Having it in asm-generic/siginfo.h doesn't make any sense as it is in no way
architecture specific.  Move it to posix-timers.h instead.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-ia64@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: sparclinux@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20170603190102.28866-4-hch@lst.de

include/asm-generic/siginfo.h

@@ -15,7 +15,6 @@
 #define __SI_CODE(T,N)	((T) | ((N) & 0xffff))
 
 struct siginfo;
-void do_schedule_next_timer(struct siginfo *info);
 
 extern int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);
 

include/linux/posix-timers.h

@@ -7,6 +7,7 @@
 #include <linux/timex.h>
 #include <linux/alarmtimer.h>
 
+struct siginfo;
 
 struct cpu_timer_list {
 	struct list_head entry;
@@ -120,4 +121,6 @@ long clock_nanosleep_restart(struct restart_block *restart_block);
 
 void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
 
+void do_schedule_next_timer(struct siginfo *info);
+
 #endif

kernel/signal.c

@@ -39,6 +39,7 @@
 #include <linux/compat.h>
 #include <linux/cn_proc.h>
 #include <linux/compiler.h>
+#include <linux/posix-timers.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/signal.h>