soundwire: add runtime BPT support #8511

Job	Run time
GCC build X86_64 with W=1 allmodconfig	1m 30s
Clang build x86_64	4m 27s
GCC build i386	2m 6s
GCC build arm64	22m 23s
GCC static -fanalyzer	3m 45s
GCC build X86_64 with W=1	2m 38s
Sparse check	3m 43s
GCC build arm64 allmodconfig	1m 23s
GCC build X86_64	13m 53s
	55m 48s

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