Fixes the following sparse warnings:
sound/soc/intel/sst/sst_acpi.c:248:5: warning:
symbol 'sst_acpi_probe' was not declared. Should it be static?
sound/soc/intel/sst/sst_acpi.c:335:5: warning:
symbol 'sst_acpi_remove' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Mark Brown <broonie@kernel.org>