wifi: rtw89: coex: Change firmware steps report to version separate

The report records the slots/events and their time cost about the code
call flow at firmware, ver 3 assign a reserved variable to recognize
the report is enabled or not. And add corresponding function to parsing
the report.

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/20230106120844.17441-4-pkshih@realtek.com