ASoC: dapm: Fix marking widgets dirty when a route is added

The current calls to dapm_mark_dirty() in snd_soc_dapm_add_path() are on a path
that is only reached if the sink widget is either a mixer or a mux. Move the
calls further up so they are called for all widget types.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>