battery_updater: Add OWNERS file

This CL is populating OWNERS file based on the candidates in the Chrome OS OWNERS status sheet.

BUG=b:132095048
TEST=None

Change-Id: I88d882775c371136c4a0f0989102a88575b8cd6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/battery_updater/+/1682778