dt-bindings: vendor-prefixes: Add FII

Adds Foxconn Industrial Internet, who have submitted a BMC device tree.

Reviewed-by: Benjamin Fair <benjaminfair@google.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20201119073230.123888-1-joel@jms.id.au


Signed-off-by: Rob Herring <robh@kernel.org>