drm/edid: add a helper function to extract the speaker allocation data block (v3)
This adds a helper function to extract the speaker allocation data block from the EDID. This data block describes what speakers are present on the display device. v2: update per Ville Syrjälä's comments v3: fix copy/paste typo in memory allocation Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Tested-by: NRafał Miłecki <zajec5@gmail.com>
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