dt-bindings: gnss: Modify u-blox to use common bindings

This modifies the existing U-Blox GNSS bindings to reference
the common GNSS YAML bindings.

Fixed an unrelated whitespace error while at it.

Cc: devicetree@vger.kernel.org
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220317225844.1262643-2-linus.walleij@linaro.org