rtw89: coex: Update BT counters while receiving report

Move _chk_btc_err and update_bt_cnt to _chk_btc_report(),
so we can update counter/info to COEX at a proper moment,
instead of relying on a user does cat the debug info periodically.

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/20211209083229.10815-6-pkshih@realtek.com