ASoC: fsi: Use of_device_get_match_data() helper

Use the of_device_get_match_data() helper instead of open coding.
Note that when used with DT, there's always a valid match.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>