Make sure that we disable legacy gadgets like USB_ETH. Our initramfs
uses configfs gadgets instead, currently RNDIS for USB networking.
In the future this can be expanded to more options like mass storage,
MIDI or whatever we're going to integrate into the OS that can be
configured by the user.
Reviewed-by: Oliver Smith <ollieparanoid@postmarketos.org>
Link: https://lists.sr.ht/~postmarketos/pmbootstrap-devel/%3C20230423163438.746054-1-luca@z3ntu.xyz%3E
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