1.modify boot form emmc4.41
2.add emmc boot part for uboot
3.modify def uboot read 1M
4.ifdef EMMC_BOOT then make E4412BL.img for exynos4412
	modified:   Makefile
	modified:   arch/arm/include/asm/arch-exynos/movi_partition.h
	modified:   board/samsung/exynos4412/irom_copy.c
	modified:   board/samsung/exynos4412/lowlevel_init.S
	modified:   common/cmd_mmc.c
	modified:   include/configs/exynos4412.h