drm/edid: rename HDMI Forum VSDB to SCDS

The HDMI spec talks about SCDS, Sink Capability Data Structure, exposed
via HF-VSDB or HF-SCDB. Rename VSDB to SCDS.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f8230e1893400e9a9c5829041a8ab36349182a54.1651569697.git.jani.nikula@intel.com