drm/amdgpu: add TA_RAS_INV_NODE value

We can set UMC node instance to invalid state if we use global channel
index, and RAS TA can choose UMC address conversion approach by checking
node_inst value.

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>