net: hibmcge: Add debugfs supported in this module

This patch initializes debugfs and creates root directory
for each device. The tx_ring and rx_ring debugfs files
are implemented together.

Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241216040532.1566229-2-shaojijie@huawei.com


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