ASoC: pxa: address unused variable warning

ASoC: pxa: address unused variable warning

gcc with W=1 reports
sound/soc/pxa/pxa-ssp.c:594:15: warning: variable 'acds' set but not used [-Wunused-but-set-variable]
                                            ^
This variable is not used so remove it.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308040619.BEismjFv-lkp@intel.com/
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Link: https://lore.kernel.org/r/20230808132519.637452-1-liaoyu15@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>