Merge branch 'net-stmmac-cleanups'

Russell King says:

====================
net: stmmac: cleanups

This series removes various redundant items in the stmmac driver:

- the unused TBI and RTBI PCS flags
- the NULL pointer initialisations for PCS methods in dwxgmac2
- the stmmac_pcs_rane() method which is never called, and it's
  associated implementations
- the redundant netif_carrier_off()s

Finally, it replaces asm/io.h with the preferred linux/io.h.
====================

Link: https://lore.kernel.org/r/Zlbp7xdUZAXblOZJ@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>