net: macb: rename macb_default_usrio to at91_default_usrio as not all platforms have mii mode control in usrio

Calling this structure macb_default_usrio is misleading, I believe, as
it implies that it should be used if your platform has nothing special
to do in usrio. Since usrio is platform dependent, the default here is
probably for each usrio to do nothing, with the macb documentation I
have access to prescribing no standard behaviour here. We noticed that
this was problematic because on mpfs, a bit that macb_default_usrio
sets to deal with the MII mode actually changes the source for the
tsu_clk to something with how the majority of mpfs devices are actually
configured!

Rename it to at91_default_usrio, since that's where the values actually
come from for these. I have no idea if any of the other platforms that
use the default actually copied at91's usrio configuration or if they
have usrio configurations where what the driver does has no impact.

Gate touching these bits behind a capability, like the clken refclock
usrio knob, so that platforms without the MII mode stuff can avoid
running this code.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260325-landowner-preformed-2922ce736337@spud
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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