[][Fix wandev not free]

[Description]
Fix wandev not free in wifi<->eth case.
To avoid "waiting for wandev to become free".

[Release-log]
N/A

Change-Id: Iea2d682b3f83f20b7eb5af80fc82e5e3dc7aec86
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4656758
3 files changed