soundwire: Intel: only handle alert events during suspended #8434

Job	Run time
GCC build X86_64	21m 26s
Sparse check	3m 52s
GCC build arm64 allmodconfig	1m 56s
GCC build X86_64 with W=1	2m 47s
GCC static -fanalyzer	4m 15s
Clang build x86_64	4m 7s
GCC build arm64	22m 37s
GCC build X86_64 with W=1 allmodconfig	1m 46s
GCC build i386	17m 22s
	1h 20m 8s

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