[][MAC80211][WiFi6/7][app][Add single wiphy support for atenl & iwpriv wrapper]

[Description]
Add single wiphy support for atenl & iwpirv wrapper
To support single wiphy, main phy idx is used for debugfs in atenl &
iwpriv wrapper.

[Release-log]
N/A

Change-Id: Ic146442a8838cd812be9e92ce3e4f5e5f32c91fe
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/9176525
6 files changed