[][Remove mwctl in development procedure]

[Description]
Remove mwctl in development procedure because these's a
separate repo exsiting to maintain it.

[Release-log]


Change-Id: Ic5b233568765133d7e46bdfbf7a18581123aaf04
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5810924
10 files changed