rtlwifi: btcoex: Add new but dummy definitions introduced by 8822b

btcoex support multiple platforms, but this drivers doesn't support full
functions yet, so this commit adds dummy definitions.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>