wifi: rtw89: coex: use new introduction BTC version format

Previous patch has added format version derived from firmware version.
Use the format version, and remove constant version number from chip_info.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221217141745.43291-3-pkshih@realtek.com