drm/amdgpu/display: fix build when CONFIG_DRM_AMD_DC_DSC_SUPPORT=n

Add proper config check.

Reviewed-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2019-10-16 12:12:24 -04:00
commit 6cbeaa8231