drm: Nuke drm_calc_{h,v}scale_relaxed()

The fuzzy drm_calc_{h,v}scale_relaxed() helpers are no longer used.
Throw them in the bin.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190206183204.21127-1-ville.syrjala@linux.intel.com


Acked-by: Alex Deucher <alexander.deucher@amd.com>