mdio-tools: use commit hash as the source version

mdio-tools: use commit hash as the source version

In light of the recent XZ events, it seems that using the tag as the
source version reference is not ideal as it can be updated by the upstream
lets switch to using the full commit hash as the source.

This also should fix the APK semantic versioning by setting PKG_VERSION as
well updating the PKG_MIRROR_HASH which got broken by recent APK changes.

Signed-off-by: Robert Marko <[email protected]>