dt-bindings: arm: actions: Document Caninos Loucos Labrador

Update the documentation to add the Caninos Loucos Labrador. Labrador
project consists of the computer on module Core v2 based on the Actions
Semi S500, computer on module Core v3 based on the Actions Semi S700
and the Labrador base boards.

Signed-off-by: Matheus Castello <matheus@castello.eng.br>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>