All of the staging components are moving to a model where the master
branch follows upstream open harmony gitee repository and the ostc
branch is re-based on that master, and contains additional patches.

During this switch the history in the master branch was re-set to point
to the mirrored upstream code. OSTC branch was re-based and the
corresponding revision was lost.

The zmk patch was applied at the "local" upstream (ostc branch), so drop
if from the recipe.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>