soundwire: take in count the bandwidth of a prepared stream #7380

Job	Run time
GCC static -fanalyzer	2m 21s
Clang build x86_64	4m 20s
GCC build arm64 allmodconfig	1m 23s
GCC build arm64	19m 54s
GCC build i386	15m 34s
GCC build X86_64	17m 28s
GCC build X86_64 with W=1	2m 25s
Sparse check	3m 52s
GCC build X86_64 with W=1 allmodconfig	1m 19s
	1h 8m 36s

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