1.modify asm ddr ctl,based on itop4412 uboot
2.modify sdmmc boot
3.add ddr debug, code ld debug
4.modify after copy boot, then jump to dmc address.
       modified:   arch/arm/cpu/armv7/start.S
       modified:   arch/arm/include/asm/arch-exynos/cpu.h
       modified:   arch/arm/include/asm/arch-exynos/movi_partition.h
       modified:   arch/arm/lib/board.c
       modified:   arch/arm/lib/crt0.S
       modified:   board/samsung/exynos4412/exynos4412.c
       modified:   board/samsung/exynos4412/lowlevel_init.S
       modified:   board/samsung/exynos4412/mem_init_smdk4212.S
       modified:   board/samsung/exynos4412/u-boot.lds
       modified:   include/configs/exynos4412.h