[][MAC80211][hostapd][Fix HOSTAPD_START_FAILED caused by ubus]

[Description]
Fix HOSTAPD_START_FAILED caused by ubus race condition.
Add sleep in netifd for ubus config_remove.
Add sleep in mac80211.sh for ubus config_add.

[Release-log]
N/A

Change-Id: Ifb2f1a665be0ff902d3e1febcb21179cc0ec7fb3
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7438009
2 files changed