net: hns3: use seq_file for files in fd/ in debugfs

This patch use seq_file for the following nodes:
fd_tcam/fd_counter

Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20250714061037.2616413-9-shaojijie@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>