drm/amd/display: Add DC DCN3.1 support to Kconfig

To enable compiling and using DCN3.1 ASICs with physical output.
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/Kconfig

@@ -31,6 +31,13 @@ config DRM_AMD_DC_SI
 	  by default. This includes Tahiti, Pitcairn, Cape Verde, Oland.
 	  Hainan is not supported by AMD DC and it has no physical DCE6.
 
+config DRM_AMD_DC_DCN3_1
+        bool "DCN 3.1 family"
+        depends on DRM_AMD_DC_DCN
+        help
+            Choose this option if you want to have
+            DCN3.1 family support for display engine
+
 config DEBUG_KERNEL_DC
 	bool "Enable kgdb break in DC"
 	depends on DRM_AMD_DC