rtc: a5 rtc interrupt not called [2/2]

PD#SWPL-111375

Problem:
add an interface to find the irq location

Solution:
add an interface to find the irq location

Verify:
a5_av400

Change-Id: Idabd1fb6dea45e692551d82b60bc4f2489f2bfec
Signed-off-by: yiting.deng <yiting.deng@amlogic.com>
diff --git a/interrupt.h b/interrupt.h
index d62fdd5..7813137 100644
--- a/interrupt.h
+++ b/interrupt.h
@@ -29,4 +29,6 @@
 
 void interrupt_enable(void);
 
+int GetIrqInner(uint32_t irq_num);
+
 #endif