wifi: rtw89: 8851b: add support WoWLAN to 8851B

Add WoWLAN stub to 8851B, and decalre this chip can support magic packet
and disconnect wakeup.

Signed-off-by: Chih-Kang Chang <gary.chang@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/20230421024551.29994-8-pkshih@realtek.com