arm64: dts: imx8mp-evk: Improve the Ethernet PHY description

stable inclusion
from stable-v5.10.88
commit 3516bc149223a4d48b0cf0beb6a15fcb147b51a1
bugzilla: 186058 https://gitee.com/openeuler/kernel/issues/I4QW6A

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3516bc149223a4d48b0cf0beb6a15fcb147b51a1

--------------------------------

commit 798a1807 upstream.

According to the datasheet RTL8211, it must be asserted low for at least
10ms and at least 72ms "for internal circuits settling time" before
accessing the PHY registers.

Add properties to describe such requirements.
Reported-by: NJoakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: NFabio Estevam <festevam@gmail.com>
Tested-by: NJoakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/boot/dts/freescale/imx8mp-evk.dts

@@ -62,6 +62,8 @@
 			reg = <1>;
 			eee-broken-1000t;
 			reset-gpios = <&gpio4 2 GPIO_ACTIVE_LOW>;
+			reset-assert-us = <10000>;
+			reset-deassert-us = <80000>;
 		};
 	};
 };