Merge branch 'refine-stmmac-code'

Tiezhu Yang says:

====================
Refine stmmac code

Here are three small patches to refine stmmac code when debugging and
testing the problem "Failed to reset the dma".
====================

Link: https://patch.msgid.link/20250811073506.27513-1-yangtiezhu@loongson.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>