drm/amd/display: Guard DML_FAIL_DSC_VALIDATION_FAILURE

[Why]
Usage of this enum is DSC-only.

[How]
Guard it with CONFIG_DRM_AMD_DC_DSC_SUPPORT.
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/display_mode_enums.h

@@ -130,7 +130,9 @@ enum dm_validation_status {
 	DML_FAIL_DIO_SUPPORT,
 	DML_FAIL_NOT_ENOUGH_DSC,
 	DML_FAIL_DSC_CLK_REQUIRED,
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
 	DML_FAIL_DSC_VALIDATION_FAILURE,
+#endif
 	DML_FAIL_URGENT_LATENCY,
 	DML_FAIL_REORDERING_BUFFER,
 	DML_FAIL_DISPCLK_DPPCLK,