[Toybox] lsusb: add -t option for tree format display

[Patel, Jignesh1]

Hi Rob,

Please find attached a patch adding tree format display to lsusb,
similar to usbutils lsusb -t. The implementation:

- Uses only toybox infrastructure functions.
- Minimal memory footprint.
- Gracefully handles missing usb.ids file.
- Shows USB device hierarchy from sysfs.

The patch is ready for review.

Thanks,
Jignesh
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