dt-bindings: i2c: adjust indentation in DTS example to coding style

Bindings coding style expects 2- or 4-space indentation in the DTS
example.  Correct files having something odd (6- or 8-space) to 4-space
while re-ordering few properties according to DTS coding style (the
first property should be compatible, then reg/ranges).  No functional
impact.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>