Kip: power_manager: low_battery_shutdown_percent to 4%

BUG=chrome-os-partner:26783
TEST=emerge-kip chromeos-bsp-kip
Verify low_battery_shutdown_percent exists in build.

Change-Id: I5d62780ad076d0f31aea47252f9a303d71f18e90
Reviewed-on: https://chromium-review.googlesource.com/190718
Reviewed-by: Todd Broch <tbroch@chromium.org>
Tested-by: Bernie Thompson <bhthompson@chromium.org>
(cherry picked from commit d4bbdaf1736e3bce03a145a0131e1bebad449bf2)
Reviewed-on: https://chromium-review.googlesource.com/192445
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Bernie Thompson <bhthompson@chromium.org>
3 files changed