drm/amdgpu/display: fix the build without CONFIG_DRM_AMD_DC_DSC_SUPPORT

Some code was missing the CONFIG_DRM_AMD_DC_DSC_SUPPORT guard.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed