arm64: dts: arm: minor whitespace cleanup around '='

The DTS code coding style expects exactly one space before and after '='
sign.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230702185315.44584-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>