Merge branch 'MDIO-bus-reset-GPIO-cleanups'

Sergei Shtylyov says:

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MDIO bus reset GPIO cleanups

Commit 4c5e7a2c0501 ("dt-bindings: mdio: Clarify binding document")
declared that a MDIO reset GPIO property should have only a single GPIO
reference/specifier, however the supporting code was left intact...
Here's a couple of the obvious cleanups to that code:

[1/2] mdio_bus: handle only single PHY reset GPIO
[2/2] mdio_bus: use devm_gpiod_get_optional()
====================

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