dt-bindings: vendor-prefixes: add freebox

Freebox is a French ISP who makes gateways and STBs.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Marc Gonzalez <mgonzalez@freebox.fr>
Link: https://lore.kernel.org/r/64e806b4-5366-4722-9aa8-c72667ce7962@freebox.fr


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>