drm/amdgpu/display: drop unused function

This is not longer used as of the latest rework of this
code so drop it to avoid a unused function warning.

Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2020-08-10 11:55:32 -04:00
commit 200b86f989