ARM: EXYNOS4: Add irq definition for kernel global timer

This patch adds IRQ_MCT_G0 to irq map. IRQ_MCT_G0 is an interrupt
of MCT comparator and used for kernel global timer.
Signed-off-by: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos4/include/mach/irqs.h

@@ -131,6 +131,7 @@
 #define IRQ_MCT_L0		COMBINER_IRQ(51, 0)
 
 #define IRQ_WDT			COMBINER_IRQ(53, 0)
+#define IRQ_MCT_G0		COMBINER_IRQ(53, 4)
 
 #define MAX_COMBINER_NR		54