drm/i915/dmc: extract function to parse css header
Let's start splitting the parse function, making all of them return the number of bytes parsed - different versions of the firmware header may require different sizes for the structures. v2: rework remaining bytes calculation on new protection for amount of bytes read Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190607091230.1489-5-lucas.demarchi@intel.com
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