irqchip: Move ARM GIC to drivers/irqchip

Now that we have drivers/irqchip, move GIC irqchip to drivers/irqchip. This
is necessary to share the GIC with arm and arm64.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 93dfd8f..98f30b0 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -2,6 +2,14 @@
 	def_bool y
 	depends on OF_IRQ
 
+config ARM_GIC
+	bool
+	select IRQ_DOMAIN
+	select MULTI_IRQ_HANDLER
+
+config GIC_NON_BANKED
+	bool
+
 config VERSATILE_FPGA_IRQ
 	bool
 	select IRQ_DOMAIN