tools: libxl: do not specify protocol node for disk or net

This node is written by the front/backends as part of their negotiation about
how to speak to each other. The toolstack has no part in this and it certainly
shouldn't be hardcoding the 32 bit protocol!

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson.citrix.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>

tools/libxl/libxl.c

@@ -1060,11 +1060,6 @@ int libxl_device_disk_add(libxl_ctx *ctx, uint32_t domid, libxl_device_disk *dis
     flexarray_append(front, "device-type");
     flexarray_append(front, disk->is_cdrom ? "cdrom" : "disk");
 
-    if (0 /* protocol != native*/) {
-        flexarray_append(front, "protocol");
-        flexarray_append(front, "x86_32-abi"); /* hardcoded ! */
-    }
-
     libxl__device_generic_add(&gc, &device,
                              libxl__xs_kvs_of_flexarray(&gc, back, back->count),
                              libxl__xs_kvs_of_flexarray(&gc, front, front->count));
@@ -1304,11 +1299,6 @@ int libxl_device_nic_add(libxl_ctx *ctx, uint32_t domid, libxl_device_nic *nic)
     flexarray_append(front, libxl__sprintf(&gc, "%02x:%02x:%02x:%02x:%02x:%02x",
                                                   nic->mac[0], nic->mac[1], nic->mac[2],
                                                   nic->mac[3], nic->mac[4], nic->mac[5]));
-    if (0 /* protocol != native*/) {
-        flexarray_append(front, "protocol");
-        flexarray_append(front, "x86_32-abi"); /* hardcoded ! */
-    }
-
     libxl__device_generic_add(&gc, &device,
                              libxl__xs_kvs_of_flexarray(&gc, back, back->count),
                              libxl__xs_kvs_of_flexarray(&gc, front, front->count));