ASoC: dt-bindings: google, cros-ec-codec: Fix dtc warnings in example

Extra dtc warnings (roughly what W=1 enables) are now enabled by default
when building the binding examples. These were fixed treewide in
5.6-rc5, but the newly added google,cros-ec-codec schema adds some new
warnings:

Documentation/devicetree/bindings/sound/google,cros-ec-codec.example.dts:17.28-21.11:
Warning (unit_address_vs_reg): /example-0/reserved_mem: node has a reg or ranges property, but no unit name
Documentation/devicetree/bindings/sound/google,cros-ec-codec.example.dts:22.19-32.11:
Warning (unit_address_vs_reg): /example-0/cros-ec@0: node has a unit name, but no reg property
Documentation/devicetree/bindings/sound/google,cros-ec-codec.example.dts:26.37-31.15:
Warning (unit_address_vs_reg): /example-0/cros-ec@0/ec-codec: node has a reg or ranges property, but no unit name

Fixing the above, then results in:

Documentation/devicetree/bindings/sound/google,cros-ec-codec.example.dts:26.13-23:
Warning (reg_format): /example-0/cros-ec@0:reg: property has invalid length (4 bytes) (#address-cells == 1, #size-cells == 1)
Documentation/devicetree/bindings/sound/google,cros-ec-codec.example.dts:27.37-32.15:
Warning (unit_address_vs_reg): /example-0/cros-ec@0/ec-codec: node has a reg or ranges property, but no unit name

Fixes: eadd54c7

 ("dt-bindings: Convert the binding file google, cros-ec-codec.txt to yaml format.")
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: alsa-devel@alsa-project.org
Cc: Benson Leung <bleung@chromium.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Cheng-Yi Chiang <cychiang@chromium.org>
Link: https://lore.kernel.org/r/20200311205841.2710-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>