ARM: mmp: append irq name of gpio device

IRQ name is required in gpio-pxa driver. So we need to append the name
in gpio device. Otherwise, we can't register gpio-pxa driver
successfully.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
diff --git a/arch/arm/mach-mmp/mmp2.c b/arch/arm/mach-mmp/mmp2.c
index 617c60a..c709a24 100644
--- a/arch/arm/mach-mmp/mmp2.c
+++ b/arch/arm/mach-mmp/mmp2.c
@@ -223,6 +223,7 @@
 	}, {
 		.start	= IRQ_MMP2_GPIO,
 		.end	= IRQ_MMP2_GPIO,
+		.name	= "gpio_mux",
 		.flags	= IORESOURCE_IRQ,
 	},
 };