ARM: imx: move irq_domain_add_legacy call into avic driver

Move irq_domain_add_legacy call from imx27-dt.c into avic init function
and have the avic driver adopt irqdomain support for both DT and non-DT
boot.

Now avic init function calls irq_alloc_descs to get irq_base and adds
a lenacy irqdomain with the irq_base, so that the mapping between avic
irq and Linux irq number can be handled by irqdomain.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>

arch/arm/mach-imx/imx27-dt.c

@@ -10,7 +10,6 @@
  */
 
 #include <linux/irq.h>
-#include <linux/irqdomain.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <asm/mach/arch.h>
@@ -33,22 +32,8 @@ static const struct of_dev_auxdata imx27_auxdata_lookup[] __initconst = {
 	{ /* sentinel */ }
 };
 
-static int __init imx27_avic_add_irq_domain(struct device_node *np,
-				struct device_node *interrupt_parent)
-{
-	irq_domain_add_legacy(np, 64, 0, 0, &irq_domain_simple_ops, NULL);
-	return 0;
-}
-
-static const struct of_device_id imx27_irq_match[] __initconst = {
-	{ .compatible = "fsl,imx27-avic", .data = imx27_avic_add_irq_domain, },
-	{ /* sentinel */ }
-};
-
 static void __init imx27_dt_init(void)
 {
-	of_irq_init(imx27_irq_match);
-
 	of_platform_populate(NULL, of_default_bus_match_table,
 			     imx27_auxdata_lookup, NULL);
 }