Individual LEDs in a GPIO LEDs device node are not addressable, thus
unit address is not correct.

dtc is also not happy:

  Warning (unit_address_vs_reg): /leds/led@5: node has a unit name, but no reg or ranges property
Reported-by: Sumit Garg <sumit.garg@linaro.org>
Closes: https://lore.kernel.org/all/CAFA6WYNRwF7GqhBk2B7i-deT3aLxNQckhnOasjip2TYm4HZgAw@mail.gmail.com/Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240314112657.167006-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>