Merge pull request #23 from in1004kyu/proto2-arndale

Set macro definition.
revived u-boot/ for FastModels
directory restructured: device code moved to devices/, device headers under include/, mct.h split into mct.h and mct_priv.h, io.h renamed to io-exynos.h and moved to devices/mct/
Merge pull request #24 from simonkim/proto2-arndale

Proto2 arndale - New devices/ directory for device code files
add stdio.c that supports printf().
It supprots %x %X %d %s %c