dt-bindings: i2c: spacemit,k1-i2c: Minor whitespace cleanup in example

The DTS code coding style expects exactly one space around '='
character.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Troy Mitchell <troymitchell988@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>