wifi: rtw89: 8922a: pass channel information when enter LPS

Newer firmware requires the driver to pass channel information
when switching from normal mode to low power mode; otherwise it
will result in poor RX beacon performance.

Signed-off-by: Kuan-Chung Chen <damon.chen@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250606020437.17160-1-pkshih@realtek.com