RTC: Include information about UIE and PIE in RTC driver proc.

Generic RTC code is always able to provide the necessary information
about update and periodic interrupts. This patch add such information to
the proc interface.

CC: Thomas Gleixner <[e-mail]>
CC: Alessandro Zummo <[e-mail]>
CC: Marcelo Roberto Jimenez <[e-mail]>
CC: [e-mail]
Signed-off-by: Marcelo Roberto Jimenez <[e-mail]>
Signed-off-by: John Stultz <[e-mail]>

drivers/rtc/rtc-proc.c

···
 				alrm.enabled ? "yes" : "no");
 		seq_printf(seq, "alrm_pending\t: %s\n",
 				alrm.pending ? "yes" : "no");
+		seq_printf(seq, "update IRQ enabled\t: %s\n",
+			(rtc->uie_rtctimer.enabled) ? "yes" : "no");
+		seq_printf(seq, "periodic IRQ enabled\t: %s\n",
+			(rtc->pie_enabled) ? "yes" : "no");
+		seq_printf(seq, "periodic IRQ frequency\t: %d\n",
+			rtc->irq_freq);
+		seq_printf(seq, "max user IRQ frequency\t: %d\n",
+			rtc->max_user_freq);
 	}
 
 	seq_printf(seq, "24hr\t\t: yes\n");