rtc: rx6110: stop setting max_user_freq

max_user_freq has not been related to the hardware RTC since commit
6610e0893b8b ("RTC: Rework RTC code to use timerqueue for events"). Stop
setting it from individual driver to avoid confusing new contributors.

Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-rx6110.c

···
 	if (err)
 		return err;
 
-	rx6110->rtc->max_user_freq = 1;
-
 	return 0;
 }