Merge branch 'stmmac-next'

Jose Abreu says:

====================
net: stmmac: Improvements for -next

Misc improvements for stmmac.

Patch 1/6, fixes a sparse warning that was introduced in recent commit in
-next.

Patch 2/6, adds the Split Header support which is also available in XGMAC
cores and now in GMAC4+ with this patch.

Patch 3/6, adds the C45 support for MDIO transactions when using XGMAC cores.

Patch 4/6, removes the speed dependency on CBS callbacks so that it can be used
in XGMAC cores.

Patch 5/6, reworks the over-engineered stmmac_rx() function so that its easier
to read.

Patch 6/6, implements the UDP Segmentation Offload feature in GMAC4+ cores.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>