wifi: rtw89: coex: Add v1 Wi-Fi firmware power-saving null data report

The later version Wi-Fi firmware will report null data TX times,
so the structure is different from before.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220913092546.43722-3-pkshih@realtek.com