dt-bindings: vendor-prefixes: add Alcatel

Document vendor prefix for Alcatel

Signed-off-by: Vincent Knecht <vincent.knecht@mailoo.org>
Link: https://lore.kernel.org/r/20210130105717.2628781-2-vincent.knecht@mailoo.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>