wifi: rtw89: add H2C command of TX time for WiFi 7 chips

BT-coexistence configure WiFi TX time to share time slots with Bluetooth
devices. Since the format is different from WiFi 6 chips, add the new
format accordingly.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250217063053.38936-3-pkshih@realtek.com