mfd: pm8xxx-irq: Provide the IRQ base address through core data

Facilitate the driver to support PMICs (such as PM8901)
with different IRQ base address.

Change-Id: I285a9b859b795508620ea6dfd7b5ef6953e7aeb3
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
diff --git a/include/linux/mfd/pm8xxx/irq.h b/include/linux/mfd/pm8xxx/irq.h
index 4e2570c..1e1fe6c 100644
--- a/include/linux/mfd/pm8xxx/irq.h
+++ b/include/linux/mfd/pm8xxx/irq.h
@@ -24,6 +24,7 @@
 struct pm8xxx_irq_core_data {
 	u32		rev;
 	int		nirqs;
+	unsigned int	base_addr;
 };
 
 struct pm8xxx_irq_platform_data {