net: hns3: add parameter check for tx_copybreak and tx_spare_buf_size

Since the driver always enables tx bounce buffer,
there are minimum values for `copybreak` and `tx_spare_buf_size`.

This patch will check and reject configurations
with values smaller than these minimums.

Closes: https://lore.kernel.org/all/20250723072900.GV2459@horms.kernel.org/


Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Link: https://patch.msgid.link/20250815100414.949752-2-shaojijie@huawei.com


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