x86: Remove do_timer hook

This is a left over of the old x86 sub arch support. Remove it and
open code it like we do in time_64.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/include/asm/do_timer.h

@@ -1,16 +0,0 @@
-/* defines for inline arch setup functions */
-#include <linux/clockchips.h>
-
-#include <asm/i8259.h>
-#include <asm/i8253.h>
-
-/**
- * do_timer_interrupt_hook - hook into timer tick
- *
- * Call the pit clock event handler. see asm/i8253.h
- **/
-
-static inline void do_timer_interrupt_hook(void)
-{
-	global_clock_event->event_handler(global_clock_event);
-}