Just tested with Kernel 5.0.1-300.fc29.armv7hl, same problem, out of 3 reboots one did not manage to initialise network.
So one of the patches I referenced above, "usb: dwc3: exynos: Fix error handling of clk_prepare_enable" is in 5.0 and just landed in 4.20.16, the other problem is basically summarised in the following post
https://www.spinics.net/lists/linux-usb/msg177861.html
But should be mitigatable with "rd.driver.pre=xhci-plat-hcd "
The kernel tried to power cycle the port;
[ 19.429292] xhci-hcd xhci-hcd.1.auto: Timeout while waiting for setup device command [ 19.637128] usb 6-1: device not accepting address 2, error -62 [...] [ 30.901110] usb 6-1: device not accepting address 3, error -62 [ 30.927259] usb usb6-port1: attempt power cycle (full boot logs can be provided if needed, but that did not bring the device up. From that state the only way to fix it was a power cycle of the whole ODROID-HC2.
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