fw: Initial BMS.

Move battery management to new file.

BUG=None
TEST=Compiled the code without any warning.

Change-Id: Ic3772459f442b49ac46ab6d66e467ab28a08c8d1
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chromeos/third_party/dolos/+/6680036
Commit-Queue: Udaya Kiran Ammu <udaykiran@google.com>
Tested-by: Samuel Jacob <samjaco@google.com>
Auto-Submit: Samuel Jacob <samjaco@google.com>
Reviewed-by: Udaya Kiran Ammu <udaykiran@google.com>
7 files changed