ASoC: Intel: sof_sdw: correct mach_params->dmic_num #7026

Job	Run time
GCC build arm64	17m 39s
Clang build x86_64	4m 0s
GCC build arm64 allmodconfig	1m 34s
GCC static -fanalyzer	3m 48s
GCC build X86_64	19m 47s
GCC build i386	15m 20s
GCC build X86_64 with W=1	2m 41s
GCC build X86_64 with W=1 allmodconfig	1m 30s
Sparse check	2m 41s
	1h 9m 0s

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