soundwire: debugfs: add root-level peripherals table #8330

Job	Run time
GCC build X86_64	20m 10s
GCC build X86_64 with W=1 allmodconfig	1m 52s
Clang build x86_64	4m 11s
GCC build X86_64 with W=1	2m 59s
GCC static -fanalyzer	4m 17s
GCC build arm64	24m 28s
GCC build arm64 allmodconfig	1m 51s
GCC build i386	17m 14s
Sparse check	4m 5s
	1h 21m 7s

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