drm/amd/display: Fix the display corruption issue on Navi10

[Why]
Screen corruption on Navi10 card

[How]
Set system context in DCN only on Renoir
Tested-by: Matt Coffin <mcoffin13@gmail.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1097,10 +1097,14 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 
 	dc_hardware_init(adev->dm.dc);
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+	if (adev->asic_type == CHIP_RENOIR) {
 		mmhub_read_system_context(adev, &pa_config);
 
 		// Call the DC init_memory func
 		dc_setup_system_context(adev->dm.dc, &pa_config);
+	}
+#endif
 
 	adev->dm.freesync_module = mod_freesync_create(adev->dm.dc);
 	if (!adev->dm.freesync_module) {