ASoC: cs4349: Drop platform data support

The struct cs4349_platform_data should be defined in a public header in
include/sound/ rather than in sound/soc/codecs folder.
In additional, the platform data support is not properly handled in this
driver so remove it now.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>