[][MAC80211][app][Update smp.sh for eth2]

[Description]
Add eth2 in smp.sh.

[Release-log]
N/A

Change-Id: I8af0b8f18a70ccfd5f82f8ac4dbde0e00144e952
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7085284
1 file changed