w1: Fix Kconfig indentation

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
	$ sed -e 's/^        /\t/' -i */Kconfig

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20191120133826.12964-1-krzk@kernel.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>