staging: fwserial: Fix Kconfig indentation (seven spaces)

Adjust indentation from seven 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/20191121132851.29072-1-krzk@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>