[PATCH -next] drm/amd/display: fix build error on arm64

[Yang Yingliang]

dcn20_build_mapped_resource() and dcn20_acquire_dsc() is not defined,
if CONFIG_DRM_AMD_DC_DCN is disabled.

Fix the following build error on arm64:

  ERROR: modpost: "dcn20_build_mapped_resource" 
[drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
  ERROR: modpost: "dcn20_acquire_dsc" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] 
undefined!

Fixes: 20dad3813b3c ("drm/amd/display: Add a helper to map ODM/MPC/Multi-Plane 
resources")
Signed-off-by: Yang Yingliang <yangyingli...@huawei.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c 
b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 4a6e867369b8..bbed5685d847 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -3721,12 +3721,16 @@ bool dc_resource_acquire_secondary_pipe_for_mpc_odm(
                else
                        sec_pipe->stream_res.opp = 
sec_pipe->top_pipe->stream_res.opp;
                if (sec_pipe->stream->timing.flags.DSC == 1) {
+#if defined(CONFIG_DRM_AMD_DC_DCN)
                        dcn20_acquire_dsc(dc, &state->res_ctx, 
&sec_pipe->stream_res.dsc, pipe_idx);
+#endif
                        ASSERT(sec_pipe->stream_res.dsc);
                        if (sec_pipe->stream_res.dsc == NULL)
                                return false;
                }
+#if defined(CONFIG_DRM_AMD_DC_DCN)
                dcn20_build_mapped_resource(dc, state, sec_pipe->stream);
+#endif
        }
 
        return true;
-- 
2.25.1