Building updated firmware for the Oolite v5.1 board

It depends, some flash chips have dedicated all needed commands for 4-byte addressing access (like the GD25Q256), some only part of them and other need explicitly switching between 3- and 4-byte addressing (like the one on this v5.1 module).

See also: Commit 22d982 ramips: add support for switching between 3-byte and 4-byte addressing on w25q256 flash

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