ARM: S5P6442: Add IRQ support

This patch adds IRQ support for S5P6442. This patch adds interrupt
register definitions, IRQ definitions for various interrupt sources
and new VIC base for VIC2 in plat-s5p common irq code.

Signed-off-by: Adityapratap Sharma <aditya.ps@samsung.com>
Signed-off-by: Atul Dahiya <atul.dahiya@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/plat-s5p/irq.c b/arch/arm/plat-s5p/irq.c
index 11535a5..25e1eb6 100644
--- a/arch/arm/plat-s5p/irq.c
+++ b/arch/arm/plat-s5p/irq.c
@@ -45,11 +45,13 @@
 		.base_irq	= IRQ_S5P_UART_BASE2,
 		.parent_irq	= IRQ_UART2,
 	},
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
 	[3] = {
 		.regs		= S5P_VA_UART3,
 		.base_irq	= IRQ_S5P_UART_BASE3,
 		.parent_irq	= IRQ_UART3,
 	},
+#endif
 };
 
 void __init s5p_init_irq(u32 *vic, u32 num_vic)