rtw88: refine tx_pwr_tbl debugfs to show channel and bandwidth

Show channel and bandwidth in debugfs tx_pwr_tbl to make it easier
to understand which tx power table is shown currently, and to reduce
additional checks through other ways.
Signed-off-by: Zong-Zhe Yang <kevin_yang@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/20211129020626.6384-1-pkshih@realtek.com

drivers/net/wireless/realtek/rtw88/debug.c

@@ -631,6 +631,8 @@ static int rtw_debugfs_get_tx_pwr_tbl(struct seq_file *m, void *v)
 	u8 ch = hal->current_channel;
 	u8 regd = rtw_regd_get(rtwdev);
 
+	seq_printf(m, "channel: %u\n", ch);
+	seq_printf(m, "bandwidth: %u\n", bw);
 	seq_printf(m, "regulatory: %s\n", rtw_get_regd_string(regd));
 	seq_printf(m, "%-4s %-10s %-3s%6s %-4s %4s (%-4s %-4s) %-4s\n",
 		   "path", "rate", "pwr", "", "base", "", "byr", "lmt", "rem");