Insignal Code for Arndale Octa - v01

tag: samsung-lt-arndale_octa-2013.12

* Original code posted by Insignal on [1] is rebased on v2012.07 to
figure out the changes done by Insignal on upstream u-boot.
* Device tree support is enabled in arndale_octa_config.h
* Support added to read and execute boot.scr from fat partition

[1] git://git.insignal.co.kr/insignal/arndale_octa-jb_mr1.1/u-boot