wifi: rtw89: add firmware suit for BB MCU 0/1

For existing chips, firmware is only for WiFi CPU, but WiFi 7 chips add
new hardware component BB MCU that needs firmware as well. The firmwares of
BB MCU 0/1 are also downloaded via the same path like WiFi CPU firmware,
and use the same firmware header format, so add firmware suits to access
them commonly.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230801021127.15919-6-pkshih@realtek.com