CHROMIUM: exynos: dts: EC related configuration is per board

CHROMIUM: exynos: dts: EC related configuration is per board

Move the Smart Battery configuration to board-specific files.
On Daisy and Snow, the Smart Battery is on the same as the EC,
on Spring, it is behind the EC.

Declare board dependant EC sub-devices as children of the EC node.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BUG=chrome-os-partner:17812
TEST=on both Snow and Spring, check that "power-supply-info" returns
acceptable values.

Change-Id: I290e5e8f3591df29a20734e9eff7eb6e03f4a1ec
Reviewed-on: https://gerrit.chromium.org/gerrit/43609
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>