drm/amdgpu: update psp_fw_type enum in amdgpu_ucode header

To match with the definition in psp firmware
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Le Ma <le.ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -125,6 +125,7 @@ enum psp_fw_type {
 	PSP_FW_TYPE_PSP_INTF_DRV,
 	PSP_FW_TYPE_PSP_DBG_DRV,
 	PSP_FW_TYPE_PSP_RAS_DRV,
+	PSP_FW_TYPE_MAX_INDEX,
 };
 
 /* version_major=2, version_minor=0 */