1.add global debug for board init
2.removed spi/onenand/pmic/lcd config
3.disable D-Cache when MMU is disabled
4.add exynos4412 messages,like:board_name,console_name
       modified:   arch/arm/lib/board.c
       modified:   arch/arm/lib/crt0.S
       modified:   board/samsung/exynos4412/Makefile
       modified:   board/samsung/exynos4412/exynos4412.c
       modified:   board/samsung/exynos4412/lowlevel_init.S
       modified:   include/configs/exynos4412.h