CHROMIUM: exynos: dts: Add first device tree for Spring

CHROMIUM: exynos: dts: Add first device tree for Spring

Add a board configuration to bring-up the upcoming Spring board.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BUG=chrome-os-partner:14489
TEST=emerge-daisy chromeos-kernel
and see the device tree compiled properly in the log.

Change-Id: Idd1c0128f88cdbc575a976dc1cf8e601e1777ba3
Reviewed-on: https://gerrit.chromium.org/gerrit/33835
Reviewed-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>