rtc: Remove hpet_rtc_dropped_irq()

hpet_rtc_dropped_irq() has been unused since
commit f52ef24be21a ("rtc/alpha: remove legacy rtc driver")

Remove it in rtc, and x86 hpet code.

Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Acked-by: Borislav Petkov (AMD) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

arch/x86/include/asm/hpet.h

···
 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
 			       unsigned char sec);
 extern int hpet_set_periodic_freq(unsigned long freq);
-extern int hpet_rtc_dropped_irq(void);
 extern int hpet_rtc_timer_init(void);
 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
 extern int hpet_register_irq_handler(rtc_irq_handler handler);

arch/x86/kernel/hpet.c

···
 }
 EXPORT_SYMBOL_GPL(hpet_set_periodic_freq);
 
-int hpet_rtc_dropped_irq(void)
-{
-	return is_hpet_enabled();
-}
-EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq);
-
 static void hpet_rtc_timer_reinit(void)
 {
 	unsigned int delta;

drivers/rtc/rtc-cmos.c

···
 	return 0;
 }
 
-static inline int hpet_rtc_dropped_irq(void)
-{
-	return 0;
-}
-
 static inline int hpet_rtc_timer_init(void)
 {
 	return 0;