drm/udl: 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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191120133341.6582-1-krzk@kernel.org

drivers/gpu/drm/udl/Kconfig

@@ -9,4 +9,4 @@ config DRM_UDL
 	select DRM_KMS_HELPER
 	help
 	  This is a KMS driver for the USB displaylink video adapters.
-          Say M/Y to add support for these devices via drm/kms interfaces.
+	  Say M/Y to add support for these devices via drm/kms interfaces.