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 <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/ta_ras_if.h

···
 #define RSP_ID_MASK (1U << 31)
 #define RSP_ID(cmdId) (((uint32_t)(cmdId)) | RSP_ID_MASK)
 
+/* invalid node instance value */
+#define TA_RAS_INV_NODE 0xffff
+
 /* RAS related enumerations */
 /**********************************************************/
 enum ras_command {