Merge branch 'net-stmmac-descriptor-cleanups-part-2'

Russell King says:

====================
net: stmmac: descriptor cleanups part 2

Part 2 of the stmmac descriptor cleanups.

- rename "priv->mode" to be more descriptive, and do the same in
  function arguments.
- simplify descriptor allocation/initialisation/freeing
- use more descriptive local variable names in stmmac_xmit()
- STMMAC_GET_ENTRY() doesn't get an entry, it moves to the next one.
  Describe this in the macro name.
====================

Link: https://patch.msgid.link/abruRQpjLyMkoUEP@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>