pdchipinfo: Increase compatibility of fw_version

The firmware version formats may vary chip to chip. fw_version field is
changed to a union of a 8 byte string and an 64-bit integer.

BUG=chrome-os-partner:62383
BRANCH=none
TEST=ectool pdchipinfo 0/1 on Electro

Change-Id: Id51e66c44338a09ed897ee61f54cd6a394400e63
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/441270
5 files changed