Log lsb-release from stateful partition also.

We were dumping the lsb-release from the rootfs of the source partition.
But we also need to dump the values in stateful for debugging features
such as channel changing since the stateful lsb-release values play a
vital role in such features.

BUG=chromium:222617
TEST=Tested on ZGB, works fine.

Change-Id: Ia160463ba88dcef92e9340033691dc23c18ad0c4
Reviewed-on: https://gerrit.chromium.org/gerrit/47067
Tested-by: Jay Srinivasan <jaysri@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Jay Srinivasan <jaysri@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
1 file changed