The MDIO controller has support to release the internal PHYs from reset
by specifying a second memory resource. This is different between the
currently supported SparX-5 and the LAN966x. Add a new compatible to
distinguish between these two.
Signed-off-by: Michael Walle <michael@walle.cc> Acked-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>