x86/acpi: Remove unused extern declaration acpi_copy_wakeup_routine()

This is now unused, so can be removed.

Signed-off-by: YueHaibing <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Link: https://lore.kernel.org/all/20230620094519.15300-1-yuehaibing%40huawei.com

Author: YueHaibing

arch/x86/kernel/acpi/sleep.h

@@ -12,7 +12,6 @@ extern int wakeup_pmode_return;
 
 extern u8 wake_sleep_flags;
 
-extern unsigned long acpi_copy_wakeup_routine(unsigned long);
 extern void wakeup_long64(void);
 
 extern void do_suspend_lowlevel(void);