ARM: dts: gemini: rename mdio to the right name

stable inclusion
from stable-5.10.53
commit 191523dcfa68cdaefec341f5e1d6f1013be1d44b
bugzilla: 175574 https://gitee.com/openeuler/kernel/issues/I4DTUX

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=191523dcfa68cdaefec341f5e1d6f1013be1d44b



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[ Upstream commit fc5b59b9 ]

ethernet-phy is not the right name for mdio, fix it.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>