arm64: dts: imx8mn-var-som: add 20ms delay to ethernet regulator enable

Hi, the following patch:

26ca44bdbd13 arm64: dts: imx8mn-var-som: add 20ms delay to ethernet regulator enable

Was introduced in kernel 6.5.

It needs to be applied to the stable kernels: 6.1 6.2 6.3 6.4

Without it, the PHY is not detected and the ethernet port is not working.

Tested on a custom board with a Variscite IMX8MN NANO SOM for the following stable kernels: 6.1 6.2 6.3 6.4

Hugo Villeneuve