axolotl: battery: initial bringup

Device tree overlays for our 3820mAh battery.
Also modify vbus supply for bringing up DP over USB-C.

Change-Id: I43994f033b5d4b85c85a696f5e3cf0e6562d7426
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
3 files changed