libweave: Remove device_kind and embedded_code_path

Keep only embedded_code, implementation will decide how to get it.
device_kind is not supported by server already.

BUG=brillo:1257
TEST=`FEATURES=test emerge-gizmo libweave buffet`
     `test_that -b $BOARD $DEV_HOST e:buffet_.*`

Change-Id: I3ed09c8e879db4c0c5737b523d3b16cd31360619
Reviewed-on: https://chromium-review.googlesource.com/293940
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
5 files changed