Fix common USB matching options for bcmxcp_usb#2270

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jimklimov wants to merge 1 commit intonetworkupstools:masterfrom jimklimov:issue-1754-bcmxcp

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Commits on Jan 19, 2024

drivers/bcmxcp*: refactor with common bcmxcp_makevartable() to sneak in nut_usb_addvars() where needed [networkupstools#1754 ]
jimklimov
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