Usr ports updating

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Even now, their availability is still limited to the Haswell boxes, which have displayed remarkable staying power given the release of replacement models.

Broadwell CPUs are ~15% faster than Haswell, like for like, but GPU performance is nearly identical, and for Kodi use they are likely indistinguishable.

All Broadwell model Chromeboxes are fully supported by the Chrome Box Kodi E-Z Setup Script.

Disabling the firmware write protect will allow us to shorten the timeout on the developer boot screen (from 30s to ~1s) in a dual boot configuration, and optionally boot directly in "legacy mode" (and into Gallium OS/Libre ELEC).

Disabling the write protect is also necessary for standalone setups so that the stock firmware can be replaced with a custom version.