soundwire: send multi sections in one BPT stream #7852

Job	Run time
Sparse check	4m 35s
GCC build X86_64 with W=1	3m 15s
GCC static -fanalyzer	4m 10s
GCC build X86_64 with W=1 allmodconfig	4m 37s
GCC build X86_64	20m 55s
Clang build x86_64	4m 44s
GCC build arm64	23m 14s
GCC build arm64 allmodconfig	3m 28s
GCC build i386	16m 10s
	1h 25m 8s

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