wifi: rtw89: fw: add checking type for variant type of firmware

For WiFi 6 chips, there is only single one firmware i.e. WiFi CPU firmware,
so no need an argument to discriminate them. For WiFi 7 chips, BB MCU
firmware is introduced, and we need to check it ready after downloading.

For each type of firmware, we need to check corresponding hardware ready
bit. After downloading all firmware, check status code to determine if
all things are ready.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230901073956.54203-5-pkshih@realtek.com