ASoC: SOF: sof-audio: Add support for loopback capture #8092

Job	Run time
Sparse check	3m 18s
GCC build arm64	22m 45s
GCC build i386	16m 57s
GCC build X86_64 with W=1	3m 13s
GCC static -fanalyzer	4m 40s
GCC build X86_64 with W=1 allmodconfig	2m 23s
GCC build X86_64	19m 24s
GCC build arm64 allmodconfig	2m 8s
Clang build x86_64	5m 2s
	1h 19m 50s

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