drm/amdgpu/cgs: add sys info query for pcie gen and link width

Needed by powerplay to properly handle pcie dpm switching.

Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/cgs_common.h

@@ -107,6 +107,8 @@ enum cgs_ucode_id {
 
 enum cgs_system_info_id {
 	CGS_SYSTEM_INFO_ADAPTER_BDF_ID = 1,
+	CGS_SYSTEM_INFO_PCIE_GEN_INFO,
+	CGS_SYSTEM_INFO_PCIE_MLW,
 	CGS_SYSTEM_INFO_ID_MAXIMUM,
 };