Revert "flapjack: do not carry LCM_ID with old board"

This reverts commit 6549da39d519b4d07e8bca7bef0393549765412b.

Reason for revert: this breaks building (run make buildall -j)

Original change's description:
> flapjack: do not carry LCM_ID with old board
> 
> With older boards there is no need to carry LCM_ID in SKU_ID
> since it's not available. In this way it can be compatible with
> the sku_id defined for older boards.
> 
> BUG=b:129569858
> TEST=build and verify the sku_id on older board.
> BRANCH=None
> 
> Change-Id: I68d8c380660eed7633b9c38a21ccd5c6ca536587
> Signed-off-by: YH Lin <yueherngl@chromium.org>
> Reviewed-on: https://chromium-review.googlesource.com/1584381
> Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>

Bug: b:129569858
Change-Id: Iefd5df18f786dc4d3fb720c18545e9109cc54e0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1586185
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Tested-by: Mathew King <mathewk@chromium.org>
2 files changed