wifi: rtw89: stop mac port function when stop_ap()

Disable hardware beacon related functions when ap stops. So hardware won't
transmit beacons while interface is already removed.

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/20221202061527.505668-3-pkshih@realtek.com