drm/scdc-helper: Remove gratuitous blank lines

It's unusual to separate kerneldoc comments from the functions that they
describe by a blank line. Remove them.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170901144430.19164-1-thierry.reding@gmail.com