rtlwifi: btcoex: Use seq_file to dump btcoex status
We use seq_file to replace RT_TRACE to dump status, then we can use 'cat' to access btcoex's status through debugfs. (i.e. /sys/kernel/debug/rtlwifi/00-11-22-33-44-55-66/btcoex) Other related changes are 1. implement btc_disp_dbg_msg() to access btcoex's common status. 2. remove obsolete field bt_exist Signed-off-by: NPing-Ke Shih <pkshih@realtek.com> Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
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