CHROMIUM: power: charger-manager: Use device tree node

We should use the device tree for charger manager. As a first step, check
the node and enable the driver only if present.

BUG=chrome-os-partner:10617
TEST=build and boot to kernel prompt on snow

Change-Id: Ic57d927a8dc2a15c250fe280a8c330e3b8e896f1
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/40168
1 file changed