1.add GIC interrupts control datasheet from www.arm.com
2.enable exynos4412 irqs. but no test!
3.support exynos4412 irqs base on linux/arch/arm/mach-exynos/irq-eint.c
	new file:   ../datasheet/arm/IHI0048B_b_gic_architecture_specification.pdf
	modified:   arch/arm/cpu/armv7/exynos/Makefile
	new file:   arch/arm/cpu/armv7/exynos/interrupts.c
	modified:   arch/arm/include/asm/arch-exynos/cpu.h
	new file:   arch/arm/include/asm/arch-exynos/interrupts.h
	new file:   arch/arm/include/asm/arch-exynos/irqs-exynos4.h
	new file:   arch/arm/include/asm/arch-exynos/irqs.h
	modified:   board/samsung/exynos4412/exynos4412.c
	modified:   include/configs/exynos4412.h