Revert "dts: phy: add GPIO number and active state used for phy reset"

VSC8541 phys need a special reset sequence, which the driver doesn't
currentlny support.  As a result enabling the reset via GPIO essentially
guarnteees that the device won't work correctly.  We've been relying on
bootloaders to reset the device for years, with this revert we'll go
back to doing so until we can sort out how to get the reset sequence
into the kernel.

This reverts commit a0fa9d7270.

Fixes: a0fa9d7270 ("dts: phy: add GPIO number and active state used for phy reset")
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts

@@ -90,7 +90,6 @@
 	phy0: ethernet-phy@0 {
 		compatible = "ethernet-phy-id0007.0771";
 		reg = <0>;
-		reset-gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
 	};
 };