Fix handling of platform_component in sof_sdw #7486

Job	Run time
Sparse check	3m 49s
GCC build X86_64 with W=1	3m 33s
GCC build X86_64 with W=1 allmodconfig	2m 27s
GCC static -fanalyzer	4m 6s
GCC build arm64 allmodconfig	1m 18s
GCC build X86_64	19m 47s
Clang build x86_64	4m 33s
GCC build arm64	20m 15s
GCC build i386	15m 17s
	1h 15m 5s

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