ASoC: simple-card-utils: remove set but not used variable 'dai_name'

Fixes gcc '-Wunused-but-set-variable' warning:

sound/soc/generic/simple-card-utils.c: In function 'asoc_simple_parse_clk':
sound/soc/generic/simple-card-utils.c:164:18: warning:
 parameter 'dai_name' set but not used [-Wunused-but-set-parameter]

It's not used since commit 0580dde5 ("ASoC: simple-card-utils: add
asoc_simple_debug_info()"), so can be removed.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>