[][MAC80211][WiFi6/7][Misc][Fix STA group_cipher get non-initailized value]

[Description]
Fix STA group_cipher get non-initailized value from AP.
This may also occur when multiple bss with different group_cipher setting.

[Release-log]
N/A

Change-Id: Ieaa24774db113b879b5218a8858a3eaa6e6d8c9c
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8160779
2 files changed