net: hns3: use seq_file for files in tx_bd_info/ and rx_bd_info/ in debugfs

This patch use seq_file for the following nodes:
tx_bd_queue_*/rx_bd_queue_*

This patch is the last modification to debugfs file.
Unused functions and variables are removed together.

Signed-off-by: Jian Shen <[email protected]>
Signed-off-by: Jijie Shao <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: IronShen