rtw89: change idle mode condition during hw_scan

Previously we only consider single interface's status, idle mode
behavior could be unexpected when multiple interfaces is active.
Change to enter/leave idle mode by mac80211's configuration state.

Signed-off-by: Po Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220401055043.12512-2-pkshih@realtek.com