[][openwrt][common][bsp][Remove garbage file]

[Description]
Remove residual mwctl file

[Release-log]
N/A

Change-Id: I0a3e6e4d45cdebe1145a4aa7862b6bf2bcdcb55d
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8548204
1 file changed