soundwire: take in count the bandwidth of a prepared stream #7384

Job	Run time
GCC build arm64 allmodconfig	1m 27s
GCC static -fanalyzer	2m 17s
Clang build x86_64	4m 0s
GCC build arm64	18m 31s
GCC build X86_64	16m 58s
GCC build i386	14m 58s
GCC build X86_64 with W=1 allmodconfig	1m 18s
GCC build X86_64 with W=1	2m 29s
Sparse check	3m 45s
	1h 5m 43s

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