of/irq: Rename "intc_desc" to "of_intc_desc" to fix OF on sh

Now CONFIG_OF can be enabled on sh:

    drivers/of/irq.c:472:8: error: redefinition of 'struct intc_desc'
    include/linux/sh_intc.h:109:8: note: originally defined here

As "intc_desc" is used all over the place in sh platform code, while
drivers/of/irq.c has a local definition used in a single function,
rename the latter by prefixing it with "of_".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index cb4b9ae..3cf7a01 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -468,7 +468,7 @@
-struct intc_desc {
+struct of_intc_desc {
 	struct list_head	list;
 	struct device_node	*dev;
 	struct device_node	*interrupt_parent;
@@ -484,7 +484,7 @@
 void __init of_irq_init(const struct of_device_id *matches)
 	struct device_node *np, *parent = NULL;
-	struct intc_desc *desc, *temp_desc;
+	struct of_intc_desc *desc, *temp_desc;
 	struct list_head intc_desc_list, intc_parent_list;
@@ -495,7 +495,7 @@
-		 * Here, we allocate and populate an intc_desc with the node
+		 * Here, we allocate and populate an of_intc_desc with the node
 		 * pointer, interrupt-parent device_node etc.
 		desc = kzalloc(sizeof(*desc), GFP_KERNEL);