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Parity calculation is necessary for VSC SDP implementation. Therefore
create new files dp_utils.c and dp_utils.h and move the parity
calculating functions here. This ensures that they are usable by SDP
programming in both dp_catalog.c and dp_audio.c

Changes in v3:
	- Change ordering of the header byte macros

Changes in v2:
	- Create new files dp_utils.c and dp_utils.h
	- Move the parity calculation to these new files instead of
	  having them in dp_catalog.c and dp_catalog.h
Signed-off-by: Paloma Arellano <quic_parellan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/579617/
Link: https://lore.kernel.org/r/20240222194025.25329-13-quic_parellan@quicinc.com

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>