ARM: use common irqchip_init for GIC init

Convert all GIC DT initialization over to use common irqchip_init
function.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: David Brown <davidb@codeaurora.org>
Cc: Daniel Walker <dwalker@fifo99.com>
Cc: Bryan Huntsman <bryanh@codeaurora.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Viresh Kumar <viresh.linux@gmail.com>
Cc: Shiraz Hashim <shiraz.hashim@st.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/arm/mach-spear13xx/spear13xx.c b/arch/arm/mach-spear13xx/spear13xx.c
index c4af775..22e3cd5 100644
--- a/arch/arm/mach-spear13xx/spear13xx.c
+++ b/arch/arm/mach-spear13xx/spear13xx.c
@@ -17,9 +17,8 @@
 #include <linux/clk.h>
 #include <linux/dw_dmac.h>
 #include <linux/err.h>
-#include <linux/of_irq.h>
+#include <linux/of.h>
 #include <asm/hardware/cache-l2x0.h>
-#include <asm/hardware/gic.h>
 #include <asm/mach/map.h>
 #include <asm/smp_twd.h>
 #include <mach/dma.h>
@@ -186,13 +185,3 @@
 struct sys_timer spear13xx_timer = {
 	.init = spear13xx_timer_init,
 };
-
-static const struct of_device_id gic_of_match[] __initconst = {
-	{ .compatible = "arm,cortex-a9-gic", .data = gic_of_init },
-	{ /* Sentinel */ }
-};
-
-void __init spear13xx_dt_init_irq(void)
-{
-	of_irq_init(gic_of_match);
-}