ASoC: sh: fsi: add fsi_version() and removed meaningless version check

This patch adds fsi_version() function for accessing version.

And there were some meaningless version check which never hit.
This patch removed it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>