[RFC] soundwire: add runtime BPT support #8036

Job	Run time
Sparse check	3m 31s
GCC build X86_64 with W=1	3m 29s
GCC static -fanalyzer	3m 9s
GCC build arm64	22m 30s
GCC build arm64 allmodconfig	2m 18s
Clang build x86_64	4m 51s
GCC build X86_64 with W=1 allmodconfig	2m 12s
GCC build i386	16m 51s
GCC build X86_64	21m 0s
	1h 19m 51s

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