ASoC: fsl_sai: Sort local variable in general way

Generally we would write code for local variable like:
static new_func()
{
	struct xxx *yyy;
	...
	int ret;
}

But this driver only follows this pattern for some functions, not all.
Thus this patch sorts the local variable in the general way.

Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com>
Reviewed-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>