Revert "soundwire: add sdw_slave_wait_for_initialization helper" #7735

Job	Run time
GCC build X86_64 with W=1 allmodconfig	1m 52s
GCC static -fanalyzer	4m 18s
Sparse check	2m 55s
GCC build X86_64 with W=1	4m 52s
GCC build i386	15m 52s
GCC build arm64	20m 54s
Clang build x86_64	5m 1s
GCC build X86_64	20m 54s
GCC build arm64 allmodconfig	1m 55s
	1h 18m 33s

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