ASoC: SOF: ipc4-pcm: fix start offset calculation for chain DMA #7804

Job	Run time
GCC build arm64 allmodconfig	2m 54s
GCC build X86_64 with W=1 allmodconfig	1m 46s
GCC build X86_64	22m 37s
Clang build x86_64	4m 29s
GCC build i386	2m 36s
Sparse check	3m 8s
GCC static -fanalyzer	3m 56s
GCC build arm64	32m 35s
GCC build X86_64 with W=1	8m 50s
	1h 22m 51s

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