Add Arndale board support

The Arndale board is based on samsung's exynos5250 SOC. For spl generation, it depends on the patch at [5].

First patch provides the basic arndale board support. The second patch adds the MMC support.

Changes in v2:
- split from earlier patchset at [3] as per Minkyu
- Removed checkpatch errors pointed out by Wolfgang
- rebased to latest u-boot-samsung master branch
- created mmc_boot.c to remove dependency on consolidation patch at [4]
- split the mmc support to new patch as it depends on [2]

[1] http://permalink.gmane.org/gmane.comp.boot-loaders.u-boot/162883
[2] http://comments.gmane.org/gmane.comp.boot-loaders.u-boot/159887
[3] http://comments.gmane.org/gmane.comp.boot-loaders.u-boot/157101
[4] http://comments.gmane.org/gmane.comp.boot-loaders.u-boot/156272

Changes in v3:
- Used dt based serial
- rebased to latest u-boot-samsung master branch

Changes in v4:
- Removed the config dependency on exynos5_dt.h as it contains smdk5250 configurations rather than the common exynos5 generic configurations.
- rebased to latest u-boot-samsung master branch

Changes in v5:
- Fix comments suggested by Minkyu
- Added SPDX-License-Identifier to new files

Changes in v6:
- Fixed missed out sorting of Maintainers entry
Changes in v7:
- Fixed regression caused due to v6.
- rebased to latest u-boot-samsung master branch
- Fixed checkpatch warning for parenthesis alignment.

[5] [PATCH v2] CONFIG: EXYNOS5: Replace misnomer SMDK5250 with EXYNOS5250 and update Makefiles

Chander Kashyap (1):
exynos5250: Add arndale board support

Inderpal Singh (1):
exynos5250: arndale: Add mmc support

 MAINTAINERS                              |    4 +
 board/samsung/arndale/Makefile           |   34 ++++
 board/samsung/arndale/arndale.c          |  101 ++++++++++++
 board/samsung/arndale/arndale_spl.c      |   50 ++++++
 board/samsung/dts/exynos5250-arndale.dts |   39 +++++
 boards.cfg                               |    1 +
 include/configs/arndale.h                |  255 ++++++++++++++++++++++++++++++
 7 files changed, 484 insertions(+)
 create mode 100644 board/samsung/arndale/Makefile
 create mode 100644 board/samsung/arndale/arndale.c
 create mode 100644 board/samsung/arndale/arndale_spl.c
 create mode 100644 board/samsung/dts/exynos5250-arndale.dts
 create mode 100644 include/configs/arndale.h