s390/vtime: Remove unused __ARCH_HAS_VTIME_TASK_SWITCH leftover

__ARCH_HAS_VTIME_TASK_SWITCH macro is not used anymore.

Signed-off-by: Alexander Gordeev <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>
Reviewed-by: Frederic Weisbecker <[e-mail]>
Acked-by: Heiko Carstens <[e-mail]>
Acked-by: Nicholas Piggin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/s390/include/asm/vtime.h

···
 #ifndef _S390_VTIME_H
 #define _S390_VTIME_H
 
-#define __ARCH_HAS_VTIME_TASK_SWITCH
-
 static inline void update_timer_sys(void)
 {
 	S390_lowcore.system_timer += S390_lowcore.last_update_timer - S390_lowcore.exit_timer;