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USB network robustness fixes

Administrator requested to merge usb-network-robustness into master

main/postmarketos-initramfs: support reading USB network UDC name from deviceinfo

Before this change the script assumed that the device has only one UDC. However it is possible for a device to have multiple UDCs, in which case the deviceinfo is the appropriate place to specify which one should be used. This change adds an optional deviceinfo variable deviceinfo_usb_network_udc to specify the UDC that should be used.

Also, before this change the script assumed the USB network interface name is "usb0". But other gadget drivers like g_cdc can claim USB interfaces before the initramfs script gets around to creating one for USB networking, so the interface might be "usb1" or something else. The configfs gadget itself can provide the actual interface name, so this change makes the script use that.

main/postmarketos-base-ui: read USB network interface name from configfs gadget

The configfs gadget can provide the actual interface name, which may not be the default "usb0" since another gadget driver might have claimed "usb0". This code is based on the start_unudhcpd function in init_functions.sh

These are extracted from https://gitlab.com/postmarketOS/pmaports/-/merge_requests/4691 . Specifically the situation there is that using upstream's defconfig for the PinePhone kernel results in a) two UDCs being present in /sys/class/udc, and b) the g_cdc gadget driver claiming usb0 for itself such that the gadget created by initramfs is usb1.

So while no device in master (not even the PinePhone) needs this MR's features right now, @craftyguy and I figured it's better to have this be reviewed and merged into master first.

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