ASoC: soc_sdw_utils: skip aux device if it is not present #8307

Job	Run time
GCC static -fanalyzer	4m 9s
GCC build arm64 allmodconfig	2m 1s
Clang build x86_64	4m 23s
Sparse check	3m 52s
GCC build X86_64 with W=1 allmodconfig	1m 51s
GCC build arm64	23m 42s
GCC build X86_64 with W=1	3m 3s
GCC build X86_64	21m 4s
GCC build i386	18m 24s
	1h 22m 29s

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