rtc: starfive: add missing irqnr.h include

Signed-off-by: Francesco Gazzetta <fgaz@fgaz.me>

Author: fgaz

drivers/rtc/rtc-starfive.c

@@ -13,6 +13,7 @@
 #include <linux/completion.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/irqnr.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>